/usr/src/usr.bin/ssh/ssh/../sshkey.c

Bug Summary

File:	src/usr.bin/ssh/ssh/../sshkey.c
Warning:	line 1751, column 7 Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret'

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name sshkey.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.bin/ssh/ssh/obj -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/usr.bin/ssh/ssh/.. -D WITH_OPENSSL -D WITH_ZLIB -D WITH_DSA -D ENABLE_PKCS11 -D HAVE_DLOPEN -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -fdebug-compilation-dir=/usr/src/usr.bin/ssh/ssh/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/usr.bin/ssh/ssh/../sshkey.c

1	/* $OpenBSD: sshkey.c,v 1.142 2024/01/11 01:45:36 djm Exp $ */
2	/*
3	* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
4	* Copyright (c) 2008 Alexander von Gernler. All rights reserved.
5	* Copyright (c) 2010,2011 Damien Miller. All rights reserved.
6	*
7	* Redistribution and use in source and binary forms, with or without
8	* modification, are permitted provided that the following conditions
9	* are met:
10	* 1. Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.
12	* 2. Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.
15	*
16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26	*/
27
28	#include <sys/types.h>
29	#include <netinet/in.h>
30
31	#ifdef WITH_OPENSSL1
32	#include <openssl/evp.h>
33	#include <openssl/err.h>
34	#include <openssl/pem.h>
35	#endif
36
37	#include "crypto_api.h"
38
39	#include <errno(*__errno()).h>
40	#include <stdio.h>
41	#include <stdlib.h>
42	#include <string.h>
43	#include <util.h>
44	#include <limits.h>
45	#include <resolv.h>
46
47	#include "ssh2.h"
48	#include "ssherr.h"
49	#include "misc.h"
50	#include "sshbuf.h"
51	#include "cipher.h"
52	#include "digest.h"
53	#define SSHKEY_INTERNAL
54	#include "sshkey.h"
55	#include "match.h"
56	#include "ssh-sk.h"
57
58	#ifdef WITH_XMSS
59	#include "sshkey-xmss.h"
60	#include "xmss_fast.h"
61	#endif
62
63	/* openssh private key file format */
64	#define MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n" "-----BEGIN OPENSSH PRIVATE KEY-----\n"
65	#define MARK_END"-----END OPENSSH PRIVATE KEY-----\n" "-----END OPENSSH PRIVATE KEY-----\n"
66	#define MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1) (sizeof(MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1)
67	#define MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1) (sizeof(MARK_END"-----END OPENSSH PRIVATE KEY-----\n") - 1)
68	#define KDFNAME"bcrypt" "bcrypt"
69	#define AUTH_MAGIC"openssh-key-v1" "openssh-key-v1"
70	#define SALT_LEN16 16
71	#define DEFAULT_CIPHERNAME"aes256-ctr" "aes256-ctr"
72	#define DEFAULT_ROUNDS24 24
73
74	/* Version identification string for SSH v1 identity files. */
75	#define LEGACY_BEGIN"SSH PRIVATE KEY FILE FORMAT 1.1\n" "SSH PRIVATE KEY FILE FORMAT 1.1\n"
76
77	/*
78	* Constants relating to "shielding" support; protection of keys expected
79	* to remain in memory for long durations
80	*/
81	#define SSHKEY_SHIELD_PREKEY_LEN(16 * 1024) (16 * 1024)
82	#define SSHKEY_SHIELD_CIPHER"aes256-ctr" "aes256-ctr" /* XXX want AES-EME* */
83	#define SSHKEY_SHIELD_PREKEY_HASH4 SSH_DIGEST_SHA5124
84
85	int sshkey_private_serialize_opt(struct sshkey *key,
86	struct sshbuf *buf, enum sshkey_serialize_rep);
87	static int sshkey_from_blob_internal(struct sshbuf *buf,
88	struct sshkey **keyp, int allow_cert);
89
90	/* Supported key types */
91	extern const struct sshkey_impl sshkey_ed25519_impl;
92	extern const struct sshkey_impl sshkey_ed25519_cert_impl;
93	extern const struct sshkey_impl sshkey_ed25519_sk_impl;
94	extern const struct sshkey_impl sshkey_ed25519_sk_cert_impl;
95	#ifdef WITH_OPENSSL1
96	extern const struct sshkey_impl sshkey_ecdsa_sk_impl;
97	extern const struct sshkey_impl sshkey_ecdsa_sk_cert_impl;
98	extern const struct sshkey_impl sshkey_ecdsa_sk_webauthn_impl;
99	extern const struct sshkey_impl sshkey_ecdsa_nistp256_impl;
100	extern const struct sshkey_impl sshkey_ecdsa_nistp256_cert_impl;
101	extern const struct sshkey_impl sshkey_ecdsa_nistp384_impl;
102	extern const struct sshkey_impl sshkey_ecdsa_nistp384_cert_impl;
103	extern const struct sshkey_impl sshkey_ecdsa_nistp521_impl;
104	extern const struct sshkey_impl sshkey_ecdsa_nistp521_cert_impl;
105	extern const struct sshkey_impl sshkey_rsa_impl;
106	extern const struct sshkey_impl sshkey_rsa_cert_impl;
107	extern const struct sshkey_impl sshkey_rsa_sha256_impl;
108	extern const struct sshkey_impl sshkey_rsa_sha256_cert_impl;
109	extern const struct sshkey_impl sshkey_rsa_sha512_impl;
110	extern const struct sshkey_impl sshkey_rsa_sha512_cert_impl;
111	# ifdef WITH_DSA1
112	extern const struct sshkey_impl sshkey_dss_impl;
113	extern const struct sshkey_impl sshkey_dsa_cert_impl;
114	# endif
115	#endif /* WITH_OPENSSL */
116	#ifdef WITH_XMSS
117	extern const struct sshkey_impl sshkey_xmss_impl;
118	extern const struct sshkey_impl sshkey_xmss_cert_impl;
119	#endif
120
121	const struct sshkey_impl * const keyimpls[] = {
122	&sshkey_ed25519_impl,
123	&sshkey_ed25519_cert_impl,
124	&sshkey_ed25519_sk_impl,
125	&sshkey_ed25519_sk_cert_impl,
126	#ifdef WITH_OPENSSL1
127	&sshkey_ecdsa_nistp256_impl,
128	&sshkey_ecdsa_nistp256_cert_impl,
129	&sshkey_ecdsa_nistp384_impl,
130	&sshkey_ecdsa_nistp384_cert_impl,
131	&sshkey_ecdsa_nistp521_impl,
132	&sshkey_ecdsa_nistp521_cert_impl,
133	&sshkey_ecdsa_sk_impl,
134	&sshkey_ecdsa_sk_cert_impl,
135	&sshkey_ecdsa_sk_webauthn_impl,
136	# ifdef WITH_DSA1
137	&sshkey_dss_impl,
138	&sshkey_dsa_cert_impl,
139	# endif
140	&sshkey_rsa_impl,
141	&sshkey_rsa_cert_impl,
142	&sshkey_rsa_sha256_impl,
143	&sshkey_rsa_sha256_cert_impl,
144	&sshkey_rsa_sha512_impl,
145	&sshkey_rsa_sha512_cert_impl,
146	#endif /* WITH_OPENSSL */
147	#ifdef WITH_XMSS
148	&sshkey_xmss_impl,
149	&sshkey_xmss_cert_impl,
150	#endif
151	NULL((void *)0)
152	};
153
154	static const struct sshkey_impl *
155	sshkey_impl_from_type(int type)
156	{
157	int i;
158
159	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
160	if (keyimpls[i]->type == type)
161	return keyimpls[i];
162	}
163	return NULL((void *)0);
164	}
165
166	static const struct sshkey_impl *
167	sshkey_impl_from_type_nid(int type, int nid)
168	{
169	int i;
170
171	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
172	if (keyimpls[i]->type == type &&
173	(keyimpls[i]->nid == 0 \|\| keyimpls[i]->nid == nid))
174	return keyimpls[i];
175	}
176	return NULL((void *)0);
177	}
178
179	static const struct sshkey_impl *
180	sshkey_impl_from_key(const struct sshkey *k)
181	{
182	if (k == NULL((void *)0))
183	return NULL((void *)0);
184	return sshkey_impl_from_type_nid(k->type, k->ecdsa_nid);
185	}
186
187	const char *
188	sshkey_type(const struct sshkey *k)
189	{
190	const struct sshkey_impl *impl;
191
192	if ((impl = sshkey_impl_from_key(k)) == NULL((void *)0))
193	return "unknown";
194	return impl->shortname;
195	}
196
197	static const char *
198	sshkey_ssh_name_from_type_nid(int type, int nid)
199	{
200	const struct sshkey_impl *impl;
201
202	if ((impl = sshkey_impl_from_type_nid(type, nid)) == NULL((void *)0))
203	return "ssh-unknown";
204	return impl->name;
205	}
206
207	int
208	sshkey_type_is_cert(int type)
209	{
210	const struct sshkey_impl *impl;
211
212	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0))
213	return 0;
214	return impl->cert;
215	}
216
217	const char *
218	sshkey_ssh_name(const struct sshkey *k)
219	{
220	return sshkey_ssh_name_from_type_nid(k->type, k->ecdsa_nid);
221	}
222
223	const char *
224	sshkey_ssh_name_plain(const struct sshkey *k)
225	{
226	return sshkey_ssh_name_from_type_nid(sshkey_type_plain(k->type),
227	k->ecdsa_nid);
228	}
229
230	int
231	sshkey_type_from_name(const char *name)
232	{
233	int i;
234	const struct sshkey_impl *impl;
235
236	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
237	impl = keyimpls[i];
238	/* Only allow shortname matches for plain key types */
239	if ((impl->name != NULL((void *)0) && strcmp(name, impl->name) == 0) \|\|
240	(!impl->cert && strcasecmp(impl->shortname, name) == 0))
241	return impl->type;
242	}
243	return KEY_UNSPEC;
244	}
245
246	static int
247	key_type_is_ecdsa_variant(int type)
248	{
249	switch (type) {
250	case KEY_ECDSA:
251	case KEY_ECDSA_CERT:
252	case KEY_ECDSA_SK:
253	case KEY_ECDSA_SK_CERT:
254	return 1;
255	}
256	return 0;
257	}
258
259	int
260	sshkey_ecdsa_nid_from_name(const char *name)
261	{
262	int i;
263
264	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
265	if (!key_type_is_ecdsa_variant(keyimpls[i]->type))
266	continue;
267	if (keyimpls[i]->name != NULL((void *)0) &&
268	strcmp(name, keyimpls[i]->name) == 0)
269	return keyimpls[i]->nid;
270	}
271	return -1;
272	}
273
274	int
275	sshkey_match_keyname_to_sigalgs(const char keyname, const char sigalgs)
276	{
277	int ktype;
278
279	if (sigalgs == NULL((void )0) \|\| sigalgs == '\0' \|\|
280	(ktype = sshkey_type_from_name(keyname)) == KEY_UNSPEC)
281	return 0;
282	else if (ktype == KEY_RSA) {
283	return match_pattern_list("ssh-rsa", sigalgs, 0) == 1 \|\|
284	match_pattern_list("rsa-sha2-256", sigalgs, 0) == 1 \|\|
285	match_pattern_list("rsa-sha2-512", sigalgs, 0) == 1;
286	} else if (ktype == KEY_RSA_CERT) {
287	return match_pattern_list("ssh-rsa-cert-v01@openssh.com",
288	sigalgs, 0) == 1 \|\|
289	match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
290	sigalgs, 0) == 1 \|\|
291	match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
292	sigalgs, 0) == 1;
293	} else
294	return match_pattern_list(keyname, sigalgs, 0) == 1;
295	}
296
297	char *
298	sshkey_alg_list(int certs_only, int plain_only, int include_sigonly, char sep)
299	{
300	char tmp, ret = NULL((void *)0);
301	size_t i, nlen, rlen = 0;
302	const struct sshkey_impl *impl;
303
304	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
305	impl = keyimpls[i];
306	if (impl->name == NULL((void *)0))
307	continue;
308	if (!include_sigonly && impl->sigonly)
309	continue;
310	if ((certs_only && !impl->cert) \|\| (plain_only && impl->cert))
311	continue;
312	if (ret != NULL((void *)0))
313	ret[rlen++] = sep;
314	nlen = strlen(impl->name);
315	if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL((void *)0)) {
316	free(ret);
317	return NULL((void *)0);
318	}
319	ret = tmp;
320	memcpy(ret + rlen, impl->name, nlen + 1);
321	rlen += nlen;
322	}
323	return ret;
324	}
325
326	int
327	sshkey_names_valid2(const char *names, int allow_wildcard, int plain_only)
328	{
329	char s, cp, *p;
330	const struct sshkey_impl *impl;
331	int i, type;
332
333	if (names == NULL((void *)0) \|\| strcmp(names, "") == 0)
334	return 0;
335	if ((s = cp = strdup(names)) == NULL((void *)0))
336	return 0;
337	for ((p = strsep(&cp, ",")); p && *p != '\0';
338	(p = strsep(&cp, ","))) {
339	type = sshkey_type_from_name(p);
340	if (type == KEY_UNSPEC) {
341	if (allow_wildcard) {
342	/*
343	* Try matching key types against the string.
344	* If any has a positive or negative match then
345	* the component is accepted.
346	*/
347	impl = NULL((void *)0);
348	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
349	if (match_pattern_list(
350	keyimpls[i]->name, p, 0) != 0) {
351	impl = keyimpls[i];
352	break;
353	}
354	}
355	if (impl != NULL((void *)0))
356	continue;
357	}
358	free(s);
359	return 0;
360	} else if (plain_only && sshkey_type_is_cert(type)) {
361	free(s);
362	return 0;
363	}
364	}
365	free(s);
366	return 1;
367	}
368
369	u_int
370	sshkey_size(const struct sshkey *k)
371	{
372	const struct sshkey_impl *impl;
373
374	if ((impl = sshkey_impl_from_key(k)) == NULL((void *)0))
375	return 0;
376	if (impl->funcs->size != NULL((void *)0))
377	return impl->funcs->size(k);
378	return impl->keybits;
379	}
380
381	static int
382	sshkey_type_is_valid_ca(int type)
383	{
384	const struct sshkey_impl *impl;
385
386	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0))
387	return 0;
388	/* All non-certificate types may act as CAs */
389	return !impl->cert;
390	}
391
392	int
393	sshkey_is_cert(const struct sshkey *k)
394	{
395	if (k == NULL((void *)0))
396	return 0;
397	return sshkey_type_is_cert(k->type);
398	}
399
400	int
401	sshkey_is_sk(const struct sshkey *k)
402	{
403	if (k == NULL((void *)0))
404	return 0;
405	switch (sshkey_type_plain(k->type)) {
406	case KEY_ECDSA_SK:
407	case KEY_ED25519_SK:
408	return 1;
409	default:
410	return 0;
411	}
412	}
413
414	/* Return the cert-less equivalent to a certified key type */
415	int
416	sshkey_type_plain(int type)
417	{
418	switch (type) {
419	case KEY_RSA_CERT:
420	return KEY_RSA;
421	case KEY_DSA_CERT:
422	return KEY_DSA;
423	case KEY_ECDSA_CERT:
424	return KEY_ECDSA;
425	case KEY_ECDSA_SK_CERT:
426	return KEY_ECDSA_SK;
427	case KEY_ED25519_CERT:
428	return KEY_ED25519;
429	case KEY_ED25519_SK_CERT:
430	return KEY_ED25519_SK;
431	case KEY_XMSS_CERT:
432	return KEY_XMSS;
433	default:
434	return type;
435	}
436	}
437
438	/* Return the cert equivalent to a plain key type */
439	static int
440	sshkey_type_certified(int type)
441	{
442	switch (type) {
443	case KEY_RSA:
444	return KEY_RSA_CERT;
445	case KEY_DSA:
446	return KEY_DSA_CERT;
447	case KEY_ECDSA:
448	return KEY_ECDSA_CERT;
449	case KEY_ECDSA_SK:
450	return KEY_ECDSA_SK_CERT;
451	case KEY_ED25519:
452	return KEY_ED25519_CERT;
453	case KEY_ED25519_SK:
454	return KEY_ED25519_SK_CERT;
455	case KEY_XMSS:
456	return KEY_XMSS_CERT;
457	default:
458	return -1;
459	}
460	}
461
462	#ifdef WITH_OPENSSL1
463	/* XXX: these are really begging for a table-driven approach */
464	int
465	sshkey_curve_name_to_nid(const char *name)
466	{
467	if (strcmp(name, "nistp256") == 0)
468	return NID_X9_62_prime256v1415;
469	else if (strcmp(name, "nistp384") == 0)
470	return NID_secp384r1715;
471	else if (strcmp(name, "nistp521") == 0)
472	return NID_secp521r1716;
473	else
474	return -1;
475	}
476
477	u_int
478	sshkey_curve_nid_to_bits(int nid)
479	{
480	switch (nid) {
481	case NID_X9_62_prime256v1415:
482	return 256;
483	case NID_secp384r1715:
484	return 384;
485	case NID_secp521r1716:
486	return 521;
487	default:
488	return 0;
489	}
490	}
491
492	int
493	sshkey_ecdsa_bits_to_nid(int bits)
494	{
495	switch (bits) {
496	case 256:
497	return NID_X9_62_prime256v1415;
498	case 384:
499	return NID_secp384r1715;
500	case 521:
501	return NID_secp521r1716;
502	default:
503	return -1;
504	}
505	}
506
507	const char *
508	sshkey_curve_nid_to_name(int nid)
509	{
510	switch (nid) {
511	case NID_X9_62_prime256v1415:
512	return "nistp256";
513	case NID_secp384r1715:
514	return "nistp384";
515	case NID_secp521r1716:
516	return "nistp521";
517	default:
518	return NULL((void *)0);
519	}
520	}
521
522	int
523	sshkey_ec_nid_to_hash_alg(int nid)
524	{
525	int kbits = sshkey_curve_nid_to_bits(nid);
526
527	if (kbits <= 0)
528	return -1;
529
530	/* RFC5656 section 6.2.1 */
531	if (kbits <= 256)
532	return SSH_DIGEST_SHA2562;
533	else if (kbits <= 384)
534	return SSH_DIGEST_SHA3843;
535	else
536	return SSH_DIGEST_SHA5124;
537	}
538	#endif /* WITH_OPENSSL */
539
540	static void
541	cert_free(struct sshkey_cert *cert)
542	{
543	u_int i;
544
545	if (cert == NULL((void *)0))
546	return;
547	sshbuf_free(cert->certblob);
548	sshbuf_free(cert->critical);
549	sshbuf_free(cert->extensions);
550	free(cert->key_id);
551	for (i = 0; i < cert->nprincipals; i++)
552	free(cert->principals[i]);
553	free(cert->principals);
554	sshkey_free(cert->signature_key);
555	free(cert->signature_type);
556	freezero(cert, sizeof(*cert));
557	}
558
559	static struct sshkey_cert *
560	cert_new(void)
561	{
562	struct sshkey_cert *cert;
563
564	if ((cert = calloc(1, sizeof(cert))) == NULL((void )0))
565	return NULL((void *)0);
566	if ((cert->certblob = sshbuf_new()) == NULL((void *)0) \|\|
567	(cert->critical = sshbuf_new()) == NULL((void *)0) \|\|
568	(cert->extensions = sshbuf_new()) == NULL((void *)0)) {
569	cert_free(cert);
570	return NULL((void *)0);
571	}
572	cert->key_id = NULL((void *)0);
573	cert->principals = NULL((void *)0);
574	cert->signature_key = NULL((void *)0);
575	cert->signature_type = NULL((void *)0);
576	return cert;
577	}
578
579	struct sshkey *
580	sshkey_new(int type)
581	{
582	struct sshkey *k;
583	const struct sshkey_impl impl = NULL((void )0);
584
585	if (type != KEY_UNSPEC &&
586	(impl = sshkey_impl_from_type(type)) == NULL((void *)0))
587	return NULL((void *)0);
588
589	/* All non-certificate types may act as CAs */
590	if ((k = calloc(1, sizeof(k))) == NULL((void )0))
591	return NULL((void *)0);
592	k->type = type;
593	k->ecdsa_nid = -1;
594	if (impl != NULL((void )0) && impl->funcs->alloc != NULL((void )0)) {
595	if (impl->funcs->alloc(k) != 0) {
596	free(k);
597	return NULL((void *)0);
598	}
599	}
600	if (sshkey_is_cert(k)) {
601	if ((k->cert = cert_new()) == NULL((void *)0)) {
602	sshkey_free(k);
603	return NULL((void *)0);
604	}
605	}
606
607	return k;
608	}
609
610	/* Frees common FIDO fields */
611	void
612	sshkey_sk_cleanup(struct sshkey *k)
613	{
614	free(k->sk_application);
615	sshbuf_free(k->sk_key_handle);
616	sshbuf_free(k->sk_reserved);
617	k->sk_application = NULL((void *)0);
618	k->sk_key_handle = k->sk_reserved = NULL((void *)0);
619	}
620
621	static void
622	sshkey_free_contents(struct sshkey *k)
623	{
624	const struct sshkey_impl *impl;
625
626	if (k == NULL((void *)0))
627	return;
628	if ((impl = sshkey_impl_from_type(k->type)) != NULL((void *)0) &&
629	impl->funcs->cleanup != NULL((void *)0))
630	impl->funcs->cleanup(k);
631	if (sshkey_is_cert(k))
632	cert_free(k->cert);
633	freezero(k->shielded_private, k->shielded_len);
634	freezero(k->shield_prekey, k->shield_prekey_len);
635	}
636
637	void
638	sshkey_free(struct sshkey *k)
639	{
640	sshkey_free_contents(k);
641	freezero(k, sizeof(*k));
642	}
643
644	static int
645	cert_compare(struct sshkey_cert a, struct sshkey_cert b)
646	{
647	if (a == NULL((void )0) && b == NULL((void )0))
648	return 1;
649	if (a == NULL((void )0) \|\| b == NULL((void )0))
650	return 0;
651	if (sshbuf_len(a->certblob) != sshbuf_len(b->certblob))
652	return 0;
653	if (timingsafe_bcmp(sshbuf_ptr(a->certblob), sshbuf_ptr(b->certblob),
654	sshbuf_len(a->certblob)) != 0)
655	return 0;
656	return 1;
657	}
658
659	/* Compares FIDO-specific pubkey fields only */
660	int
661	sshkey_sk_fields_equal(const struct sshkey a, const struct sshkey b)
662	{
663	if (a->sk_application == NULL((void )0) \|\| b->sk_application == NULL((void )0))
664	return 0;
665	if (strcmp(a->sk_application, b->sk_application) != 0)
666	return 0;
667	return 1;
668	}
669
670	/*
671	* Compare public portions of key only, allowing comparisons between
672	* certificates and plain keys too.
673	*/
674	int
675	sshkey_equal_public(const struct sshkey a, const struct sshkey b)
676	{
677	const struct sshkey_impl *impl;
678
679	if (a == NULL((void )0) \|\| b == NULL((void )0) \|\|
680	sshkey_type_plain(a->type) != sshkey_type_plain(b->type))
681	return 0;
682	if ((impl = sshkey_impl_from_type(a->type)) == NULL((void *)0))
683	return 0;
684	return impl->funcs->equal(a, b);
685	}
686
687	int
688	sshkey_equal(const struct sshkey a, const struct sshkey b)
689	{
690	if (a == NULL((void )0) \|\| b == NULL((void )0) \|\| a->type != b->type)
691	return 0;
692	if (sshkey_is_cert(a)) {
693	if (!cert_compare(a->cert, b->cert))
694	return 0;
695	}
696	return sshkey_equal_public(a, b);
697	}
698
699
700	/* Serialise common FIDO key parts */
701	int
702	sshkey_serialize_sk(const struct sshkey key, struct sshbuf b)
703	{
704	int r;
705
706	if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0)
707	return r;
708
709	return 0;
710	}
711
712	static int
713	to_blob_buf(const struct sshkey key, struct sshbuf b, int force_plain,
714	enum sshkey_serialize_rep opts)
715	{
716	int type, ret = SSH_ERR_INTERNAL_ERROR-1;
717	const char *typename;
718	const struct sshkey_impl *impl;
719
720	if (key == NULL((void *)0))
721	return SSH_ERR_INVALID_ARGUMENT-10;
722
723	type = force_plain ? sshkey_type_plain(key->type) : key->type;
724
725	if (sshkey_type_is_cert(type)) {
726	if (key->cert == NULL((void *)0))
727	return SSH_ERR_EXPECTED_CERT-16;
728	if (sshbuf_len(key->cert->certblob) == 0)
729	return SSH_ERR_KEY_LACKS_CERTBLOB-17;
730	/* Use the existing blob */
731	if ((ret = sshbuf_putb(b, key->cert->certblob)) != 0)
732	return ret;
733	return 0;
734	}
735	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0))
736	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
737
738	typename = sshkey_ssh_name_from_type_nid(type, key->ecdsa_nid);
739	if ((ret = sshbuf_put_cstring(b, typename)) != 0)
740	return ret;
741	return impl->funcs->serialize_public(key, b, opts);
742	}
743
744	int
745	sshkey_putb(const struct sshkey key, struct sshbuf b)
746	{
747	return to_blob_buf(key, b, 0, SSHKEY_SERIALIZE_DEFAULT);
748	}
749
750	int
751	sshkey_puts_opts(const struct sshkey key, struct sshbuf b,
752	enum sshkey_serialize_rep opts)
753	{
754	struct sshbuf *tmp;
755	int r;
756
757	if ((tmp = sshbuf_new()) == NULL((void *)0))
758	return SSH_ERR_ALLOC_FAIL-2;
759	r = to_blob_buf(key, tmp, 0, opts);
760	if (r == 0)
761	r = sshbuf_put_stringb(b, tmp);
762	sshbuf_free(tmp);
763	return r;
764	}
765
766	int
767	sshkey_puts(const struct sshkey key, struct sshbuf b)
768	{
769	return sshkey_puts_opts(key, b, SSHKEY_SERIALIZE_DEFAULT);
770	}
771
772	int
773	sshkey_putb_plain(const struct sshkey key, struct sshbuf b)
774	{
775	return to_blob_buf(key, b, 1, SSHKEY_SERIALIZE_DEFAULT);
776	}
777
778	static int
779	to_blob(const struct sshkey key, u_char blobp, size_t lenp, int force_plain,
780	enum sshkey_serialize_rep opts)
781	{
782	int ret = SSH_ERR_INTERNAL_ERROR-1;
783	size_t len;
784	struct sshbuf b = NULL((void )0);
785
786	if (lenp != NULL((void *)0))
787	*lenp = 0;
788	if (blobp != NULL((void *)0))
789	blobp = NULL((void )0);
790	if ((b = sshbuf_new()) == NULL((void *)0))
791	return SSH_ERR_ALLOC_FAIL-2;
792	if ((ret = to_blob_buf(key, b, force_plain, opts)) != 0)
793	goto out;
794	len = sshbuf_len(b);
795	if (lenp != NULL((void *)0))
796	*lenp = len;
797	if (blobp != NULL((void *)0)) {
798	if ((blobp = malloc(len)) == NULL((void )0)) {
799	ret = SSH_ERR_ALLOC_FAIL-2;
800	goto out;
801	}
802	memcpy(*blobp, sshbuf_ptr(b), len);
803	}
804	ret = 0;
805	out:
806	sshbuf_free(b);
807	return ret;
808	}
809
810	int
811	sshkey_to_blob(const struct sshkey key, u_char blobp, size_t lenp)
812	{
813	return to_blob(key, blobp, lenp, 0, SSHKEY_SERIALIZE_DEFAULT);
814	}
815
816	int
817	sshkey_plain_to_blob(const struct sshkey key, u_char blobp, size_t lenp)
818	{
819	return to_blob(key, blobp, lenp, 1, SSHKEY_SERIALIZE_DEFAULT);
820	}
821
822	int
823	sshkey_fingerprint_raw(const struct sshkey *k, int dgst_alg,
824	u_char *retp, size_t lenp)
825	{
826	u_char blob = NULL((void )0), ret = NULL((void )0);
827	size_t blob_len = 0;
828	int r = SSH_ERR_INTERNAL_ERROR-1;
829
830	if (retp != NULL((void *)0))
831	retp = NULL((void )0);
832	if (lenp != NULL((void *)0))
833	*lenp = 0;
834	if (ssh_digest_bytes(dgst_alg) == 0) {
835	r = SSH_ERR_INVALID_ARGUMENT-10;
836	goto out;
837	}
838	if ((r = to_blob(k, &blob, &blob_len, 1, SSHKEY_SERIALIZE_DEFAULT))
839	!= 0)
840	goto out;
841	if ((ret = calloc(1, SSH_DIGEST_MAX_LENGTH64)) == NULL((void *)0)) {
842	r = SSH_ERR_ALLOC_FAIL-2;
843	goto out;
844	}
845	if ((r = ssh_digest_memory(dgst_alg, blob, blob_len,
846	ret, SSH_DIGEST_MAX_LENGTH64)) != 0)
847	goto out;
848	/* success */
849	if (retp != NULL((void *)0)) {
850	*retp = ret;
851	ret = NULL((void *)0);
852	}
853	if (lenp != NULL((void *)0))
854	*lenp = ssh_digest_bytes(dgst_alg);
855	r = 0;
856	out:
857	free(ret);
858	if (blob != NULL((void *)0))
859	freezero(blob, blob_len);
860	return r;
861	}
862
863	static char *
864	fingerprint_b64(const char alg, u_char dgst_raw, size_t dgst_raw_len)
865	{
866	char *ret;
867	size_t plen = strlen(alg) + 1;
868	size_t rlen = ((dgst_raw_len + 2) / 3) * 4 + plen + 1;
869
870	if (dgst_raw_len > 65536 \|\| (ret = calloc(1, rlen)) == NULL((void *)0))
871	return NULL((void *)0);
872	strlcpy(ret, alg, rlen);
873	strlcat(ret, ":", rlen);
874	if (dgst_raw_len == 0)
875	return ret;
876	if (b64_ntop__b64_ntop(dgst_raw, dgst_raw_len, ret + plen, rlen - plen) == -1) {
877	freezero(ret, rlen);
878	return NULL((void *)0);
879	}
880	/* Trim padding characters from end */
881	ret[strcspn(ret, "=")] = '\0';
882	return ret;
883	}
884
885	static char *
886	fingerprint_hex(const char alg, u_char dgst_raw, size_t dgst_raw_len)
887	{
888	char *retval, hex[5];
889	size_t i, rlen = dgst_raw_len * 3 + strlen(alg) + 2;
890
891	if (dgst_raw_len > 65536 \|\| (retval = calloc(1, rlen)) == NULL((void *)0))
892	return NULL((void *)0);
893	strlcpy(retval, alg, rlen);
894	strlcat(retval, ":", rlen);
895	for (i = 0; i < dgst_raw_len; i++) {
896	snprintf(hex, sizeof(hex), "%s%02x",
897	i > 0 ? ":" : "", dgst_raw[i]);
898	strlcat(retval, hex, rlen);
899	}
900	return retval;
901	}
902
903	static char *
904	fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
905	{
906	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
907	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
908	'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
909	u_int i, j = 0, rounds, seed = 1;
910	char *retval;
911
912	rounds = (dgst_raw_len / 2) + 1;
913	if ((retval = calloc(rounds, 6)) == NULL((void *)0))
914	return NULL((void *)0);
915	retval[j++] = 'x';
916	for (i = 0; i < rounds; i++) {
917	u_int idx0, idx1, idx2, idx3, idx4;
918	if ((i + 1 < rounds) \|\| (dgst_raw_len % 2 != 0)) {
919	idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
920	seed) % 6;
921	idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
922	idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
923	(seed / 6)) % 6;
924	retval[j++] = vowels[idx0];
925	retval[j++] = consonants[idx1];
926	retval[j++] = vowels[idx2];
927	if ((i + 1) < rounds) {
928	idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
929	idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
930	retval[j++] = consonants[idx3];
931	retval[j++] = '-';
932	retval[j++] = consonants[idx4];
933	seed = ((seed * 5) +
934	((((u_int)(dgst_raw[2 * i])) * 7) +
935	((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
936	}
937	} else {
938	idx0 = seed % 6;
939	idx1 = 16;
940	idx2 = seed / 6;
941	retval[j++] = vowels[idx0];
942	retval[j++] = consonants[idx1];
943	retval[j++] = vowels[idx2];
944	}
945	}
946	retval[j++] = 'x';
947	retval[j++] = '\0';
948	return retval;
949	}
950
951	/*
952	* Draw an ASCII-Art representing the fingerprint so human brain can
953	* profit from its built-in pattern recognition ability.
954	* This technique is called "random art" and can be found in some
955	* scientific publications like this original paper:
956	*
957	* "Hash Visualization: a New Technique to improve Real-World Security",
958	* Perrig A. and Song D., 1999, International Workshop on Cryptographic
959	* Techniques and E-Commerce (CrypTEC '99)
960	* sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
961	*
962	* The subject came up in a talk by Dan Kaminsky, too.
963	*
964	* If you see the picture is different, the key is different.
965	* If the picture looks the same, you still know nothing.
966	*
967	* The algorithm used here is a worm crawling over a discrete plane,
968	* leaving a trace (augmenting the field) everywhere it goes.
969	* Movement is taken from dgst_raw 2bit-wise. Bumping into walls
970	* makes the respective movement vector be ignored for this turn.
971	* Graphs are not unambiguous, because circles in graphs can be
972	* walked in either direction.
973	*/
974
975	/*
976	* Field sizes for the random art. Have to be odd, so the starting point
977	* can be in the exact middle of the picture, and FLDBASE should be >=8 .
978	* Else pictures would be too dense, and drawing the frame would
979	* fail, too, because the key type would not fit in anymore.
980	*/
981	#define FLDBASE8 8
982	#define FLDSIZE_Y(8 + 1) (FLDBASE8 + 1)
983	#define FLDSIZE_X(8 * 2 + 1) (FLDBASE8 * 2 + 1)
984	static char *
985	fingerprint_randomart(const char alg, u_char dgst_raw, size_t dgst_raw_len,
986	const struct sshkey *k)
987	{
988	/*
989	* Chars to be used after each other every time the worm
990	* intersects with itself. Matter of taste.
991	*/
992	char augmentation_string = " .o+=BOX@%&#/^SE";
993	char retval, p, title[FLDSIZE_X(8 * 2 + 1)], hash[FLDSIZE_X(8 * 2 + 1)];
994	u_char field[FLDSIZE_X(8 * 2 + 1)][FLDSIZE_Y(8 + 1)];
995	size_t i, tlen, hlen;
996	u_int b;
997	int x, y, r;
998	size_t len = strlen(augmentation_string) - 1;
999
1000	if ((retval = calloc((FLDSIZE_X(8 * 2 + 1) + 3), (FLDSIZE_Y(8 + 1) + 2))) == NULL((void *)0))
1001	return NULL((void *)0);
1002
1003	/* initialize field */
1004	memset(field, 0, FLDSIZE_X(8 * 2 + 1) * FLDSIZE_Y(8 + 1) * sizeof(char));
1005	x = FLDSIZE_X(8 * 2 + 1) / 2;
1006	y = FLDSIZE_Y(8 + 1) / 2;
1007
1008	/* process raw key */
1009	for (i = 0; i < dgst_raw_len; i++) {
1010	int input;
1011	/* each byte conveys four 2-bit move commands */
1012	input = dgst_raw[i];
1013	for (b = 0; b < 4; b++) {
1014	/* evaluate 2 bit, rest is shifted later */
1015	x += (input & 0x1) ? 1 : -1;
1016	y += (input & 0x2) ? 1 : -1;
1017
1018	/* assure we are still in bounds */
1019	x = MAXIMUM(x, 0)(((x) > (0)) ? (x) : (0));
1020	y = MAXIMUM(y, 0)(((y) > (0)) ? (y) : (0));
1021	x = MINIMUM(x, FLDSIZE_X - 1)(((x) < ((8 * 2 + 1) - 1)) ? (x) : ((8 * 2 + 1) - 1));
1022	y = MINIMUM(y, FLDSIZE_Y - 1)(((y) < ((8 + 1) - 1)) ? (y) : ((8 + 1) - 1));
1023
1024	/* augment the field */
1025	if (field[x][y] < len - 2)
1026	field[x][y]++;
1027	input = input >> 2;
1028	}
1029	}
1030
1031	/* mark starting point and end point*/
1032	field[FLDSIZE_X(8 * 2 + 1) / 2][FLDSIZE_Y(8 + 1) / 2] = len - 1;
1033	field[x][y] = len;
1034
1035	/* assemble title */
1036	r = snprintf(title, sizeof(title), "[%s %u]",
1037	sshkey_type(k), sshkey_size(k));
1038	/* If [type size] won't fit, then try [type]; fits "[ED25519-CERT]" */
1039	if (r < 0 \|\| r > (int)sizeof(title))
1040	r = snprintf(title, sizeof(title), "[%s]", sshkey_type(k));
1041	tlen = (r <= 0) ? 0 : strlen(title);
1042
1043	/* assemble hash ID. */
1044	r = snprintf(hash, sizeof(hash), "[%s]", alg);
1045	hlen = (r <= 0) ? 0 : strlen(hash);
1046
1047	/* output upper border */
1048	p = retval;
1049	*p++ = '+';
1050	for (i = 0; i < (FLDSIZE_X(8 * 2 + 1) - tlen) / 2; i++)
1051	*p++ = '-';
1052	memcpy(p, title, tlen);
1053	p += tlen;
1054	for (i += tlen; i < FLDSIZE_X(8 * 2 + 1); i++)
1055	*p++ = '-';
1056	*p++ = '+';
1057	*p++ = '\n';
1058
1059	/* output content */
1060	for (y = 0; y < FLDSIZE_Y(8 + 1); y++) {
1061	*p++ = '\|';
1062	for (x = 0; x < FLDSIZE_X(8 * 2 + 1); x++)
1063	*p++ = augmentation_string[MINIMUM(field[x][y], len)(((field[x][y]) < (len)) ? (field[x][y]) : (len))];
1064	*p++ = '\|';
1065	*p++ = '\n';
1066	}
1067
1068	/* output lower border */
1069	*p++ = '+';
1070	for (i = 0; i < (FLDSIZE_X(8 * 2 + 1) - hlen) / 2; i++)
1071	*p++ = '-';
1072	memcpy(p, hash, hlen);
1073	p += hlen;
1074	for (i += hlen; i < FLDSIZE_X(8 * 2 + 1); i++)
1075	*p++ = '-';
1076	*p++ = '+';
1077
1078	return retval;
1079	}
1080
1081	char *
1082	sshkey_fingerprint(const struct sshkey *k, int dgst_alg,
1083	enum sshkey_fp_rep dgst_rep)
1084	{
1085	char retval = NULL((void )0);
1086	u_char *dgst_raw;
1087	size_t dgst_raw_len;
1088
1089	if (sshkey_fingerprint_raw(k, dgst_alg, &dgst_raw, &dgst_raw_len) != 0)
1090	return NULL((void *)0);
1091	switch (dgst_rep) {
1092	case SSH_FP_DEFAULT:
1093	if (dgst_alg == SSH_DIGEST_MD50) {
1094	retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1095	dgst_raw, dgst_raw_len);
1096	} else {
1097	retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1098	dgst_raw, dgst_raw_len);
1099	}
1100	break;
1101	case SSH_FP_HEX:
1102	retval = fingerprint_hex(ssh_digest_alg_name(dgst_alg),
1103	dgst_raw, dgst_raw_len);
1104	break;
1105	case SSH_FP_BASE64:
1106	retval = fingerprint_b64(ssh_digest_alg_name(dgst_alg),
1107	dgst_raw, dgst_raw_len);
1108	break;
1109	case SSH_FP_BUBBLEBABBLE:
1110	retval = fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
1111	break;
1112	case SSH_FP_RANDOMART:
1113	retval = fingerprint_randomart(ssh_digest_alg_name(dgst_alg),
1114	dgst_raw, dgst_raw_len, k);
1115	break;
1116	default:
1117	freezero(dgst_raw, dgst_raw_len);
1118	return NULL((void *)0);
1119	}
1120	freezero(dgst_raw, dgst_raw_len);
1121	return retval;
1122	}
1123
1124	static int
1125	peek_type_nid(const char s, size_t l, int nid)
1126	{
1127	const struct sshkey_impl *impl;
1128	int i;
1129
1130	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
1131	impl = keyimpls[i];
1132	if (impl->name == NULL((void *)0) \|\| strlen(impl->name) != l)
1133	continue;
1134	if (memcmp(s, impl->name, l) == 0) {
1135	*nid = -1;
1136	if (key_type_is_ecdsa_variant(impl->type))
1137	*nid = impl->nid;
1138	return impl->type;
1139	}
1140	}
1141	return KEY_UNSPEC;
1142	}
1143
1144	/* XXX this can now be made const char * */
1145	int
1146	sshkey_read(struct sshkey ret, char *cpp)
1147	{
1148	struct sshkey *k;
1149	char cp, blobcopy;
1150	size_t space;
1151	int r, type, curve_nid = -1;
1152	struct sshbuf *blob;
1153
1154	if (ret == NULL((void *)0))
1155	return SSH_ERR_INVALID_ARGUMENT-10;
1156	if (ret->type != KEY_UNSPEC && sshkey_impl_from_type(ret->type) == NULL((void *)0))
1157	return SSH_ERR_INVALID_ARGUMENT-10;
1158
1159	/* Decode type */
1160	cp = *cpp;
1161	space = strcspn(cp, " \t");
1162	if (space == strlen(cp))
1163	return SSH_ERR_INVALID_FORMAT-4;
1164	if ((type = peek_type_nid(cp, space, &curve_nid)) == KEY_UNSPEC)
1165	return SSH_ERR_INVALID_FORMAT-4;
1166
1167	/* skip whitespace */
1168	for (cp += space; cp == ' ' \|\| cp == '\t'; cp++)
1169	;
1170	if (*cp == '\0')
1171	return SSH_ERR_INVALID_FORMAT-4;
1172	if (ret->type != KEY_UNSPEC && ret->type != type)
1173	return SSH_ERR_KEY_TYPE_MISMATCH-13;
1174	if ((blob = sshbuf_new()) == NULL((void *)0))
1175	return SSH_ERR_ALLOC_FAIL-2;
1176
1177	/* find end of keyblob and decode */
1178	space = strcspn(cp, " \t");
1179	if ((blobcopy = strndup(cp, space)) == NULL((void *)0)) {
1180	sshbuf_free(blob);
1181	return SSH_ERR_ALLOC_FAIL-2;
1182	}
1183	if ((r = sshbuf_b64tod(blob, blobcopy)) != 0) {
1184	free(blobcopy);
1185	sshbuf_free(blob);
1186	return r;
1187	}
1188	free(blobcopy);
1189	if ((r = sshkey_fromb(blob, &k)) != 0) {
1190	sshbuf_free(blob);
1191	return r;
1192	}
1193	sshbuf_free(blob);
1194
1195	/* skip whitespace and leave cp at start of comment */
1196	for (cp += space; cp == ' ' \|\| cp == '\t'; cp++)
1197	;
1198
1199	/* ensure type of blob matches type at start of line */
1200	if (k->type != type) {
1201	sshkey_free(k);
1202	return SSH_ERR_KEY_TYPE_MISMATCH-13;
1203	}
1204	if (key_type_is_ecdsa_variant(type) && curve_nid != k->ecdsa_nid) {
1205	sshkey_free(k);
1206	return SSH_ERR_EC_CURVE_MISMATCH-15;
1207	}
1208
1209	/* Fill in ret from parsed key */
1210	sshkey_free_contents(ret);
1211	ret = k;
1212	freezero(k, sizeof(*k));
1213
1214	/* success */
1215	*cpp = cp;
1216	return 0;
1217	}
1218
1219	int
1220	sshkey_to_base64(const struct sshkey key, char *b64p)
1221	{
1222	int r = SSH_ERR_INTERNAL_ERROR-1;
1223	struct sshbuf b = NULL((void )0);
1224	char uu = NULL((void )0);
1225
1226	if (b64p != NULL((void *)0))
1227	b64p = NULL((void )0);
1228	if ((b = sshbuf_new()) == NULL((void *)0))
1229	return SSH_ERR_ALLOC_FAIL-2;
1230	if ((r = sshkey_putb(key, b)) != 0)
1231	goto out;
1232	if ((uu = sshbuf_dtob64_string(b, 0)) == NULL((void *)0)) {
1233	r = SSH_ERR_ALLOC_FAIL-2;
1234	goto out;
1235	}
1236	/* Success */
1237	if (b64p != NULL((void *)0)) {
1238	*b64p = uu;
1239	uu = NULL((void *)0);
1240	}
1241	r = 0;
1242	out:
1243	sshbuf_free(b);
1244	free(uu);
1245	return r;
1246	}
1247
1248	int
1249	sshkey_format_text(const struct sshkey key, struct sshbuf b)
1250	{
1251	int r = SSH_ERR_INTERNAL_ERROR-1;
1252	char uu = NULL((void )0);
1253
1254	if ((r = sshkey_to_base64(key, &uu)) != 0)
1255	goto out;
1256	if ((r = sshbuf_putf(b, "%s %s",
1257	sshkey_ssh_name(key), uu)) != 0)
1258	goto out;
1259	r = 0;
1260	out:
1261	free(uu);
1262	return r;
1263	}
1264
1265	int
1266	sshkey_write(const struct sshkey key, FILE f)
1267	{
1268	struct sshbuf b = NULL((void )0);
1269	int r = SSH_ERR_INTERNAL_ERROR-1;
1270
1271	if ((b = sshbuf_new()) == NULL((void *)0))
1272	return SSH_ERR_ALLOC_FAIL-2;
1273	if ((r = sshkey_format_text(key, b)) != 0)
1274	goto out;
1275	if (fwrite(sshbuf_ptr(b), sshbuf_len(b), 1, f) != 1) {
1276	if (feof(f)(!__isthreaded ? (((f)->_flags & 0x0020) != 0) : (feof )(f)))
1277	errno(*__errno()) = EPIPE32;
1278	r = SSH_ERR_SYSTEM_ERROR-24;
1279	goto out;
1280	}
1281	/* Success */
1282	r = 0;
1283	out:
1284	sshbuf_free(b);
1285	return r;
1286	}
1287
1288	const char *
1289	sshkey_cert_type(const struct sshkey *k)
1290	{
1291	switch (k->cert->type) {
1292	case SSH2_CERT_TYPE_USER1:
1293	return "user";
1294	case SSH2_CERT_TYPE_HOST2:
1295	return "host";
1296	default:
1297	return "unknown";
1298	}
1299	}
1300
1301	int
1302	sshkey_check_rsa_length(const struct sshkey *k, int min_size)
1303	{
1304	#ifdef WITH_OPENSSL1
1305	const BIGNUM *rsa_n;
1306	int nbits;
1307
1308	if (k == NULL((void )0) \|\| k->rsa == NULL((void )0) \|\|
1309	(k->type != KEY_RSA && k->type != KEY_RSA_CERT))
1310	return 0;
1311	RSA_get0_key(k->rsa, &rsa_n, NULL((void )0), NULL((void )0));
1312	nbits = BN_num_bits(rsa_n);
1313	if (nbits < SSH_RSA_MINIMUM_MODULUS_SIZE1024 \|\|
1314	(min_size > 0 && nbits < min_size))
1315	return SSH_ERR_KEY_LENGTH-56;
1316	#endif /* WITH_OPENSSL */
1317	return 0;
1318	}
1319
1320	#ifdef WITH_OPENSSL1
1321	int
1322	sshkey_ecdsa_key_to_nid(EC_KEY *k)
1323	{
1324	EC_GROUP *eg;
1325	int nids[] = {
1326	NID_X9_62_prime256v1415,
1327	NID_secp384r1715,
1328	NID_secp521r1716,
1329	-1
1330	};
1331	int nid;
1332	u_int i;
1333	const EC_GROUP *g = EC_KEY_get0_group(k);
1334
1335	/*
1336	* The group may be stored in a ASN.1 encoded private key in one of two
1337	* ways: as a "named group", which is reconstituted by ASN.1 object ID
1338	* or explicit group parameters encoded into the key blob. Only the
1339	* "named group" case sets the group NID for us, but we can figure
1340	* it out for the other case by comparing against all the groups that
1341	* are supported.
1342	*/
1343	if ((nid = EC_GROUP_get_curve_name(g)) > 0)
1344	return nid;
1345	for (i = 0; nids[i] != -1; i++) {
1346	if ((eg = EC_GROUP_new_by_curve_name(nids[i])) == NULL((void *)0))
1347	return -1;
1348	if (EC_GROUP_cmp(g, eg, NULL((void *)0)) == 0)
1349	break;
1350	EC_GROUP_free(eg);
1351	}
1352	if (nids[i] != -1) {
1353	/* Use the group with the NID attached */
1354	EC_GROUP_set_asn1_flag(eg, OPENSSL_EC_NAMED_CURVE0x001);
1355	if (EC_KEY_set_group(k, eg) != 1) {
1356	EC_GROUP_free(eg);
1357	return -1;
1358	}
1359	}
1360	return nids[i];
1361	}
1362	#endif /* WITH_OPENSSL */
1363
1364	int
1365	sshkey_generate(int type, u_int bits, struct sshkey **keyp)
1366	{
1367	struct sshkey *k;
1368	int ret = SSH_ERR_INTERNAL_ERROR-1;
1369	const struct sshkey_impl *impl;
1370
1371	if (keyp == NULL((void *)0) \|\| sshkey_type_is_cert(type))
1372	return SSH_ERR_INVALID_ARGUMENT-10;
1373	keyp = NULL((void )0);
1374	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0))
1375	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
1376	if (impl->funcs->generate == NULL((void *)0))
1377	return SSH_ERR_FEATURE_UNSUPPORTED-59;
1378	if ((k = sshkey_new(KEY_UNSPEC)) == NULL((void *)0))
1379	return SSH_ERR_ALLOC_FAIL-2;
1380	k->type = type;
1381	if ((ret = impl->funcs->generate(k, bits)) != 0) {
1382	sshkey_free(k);
1383	return ret;
1384	}
1385	/* success */
1386	*keyp = k;
1387	return 0;
1388	}
1389
1390	int
1391	sshkey_cert_copy(const struct sshkey from_key, struct sshkey to_key)
1392	{
1393	u_int i;
1394	const struct sshkey_cert *from;
1395	struct sshkey_cert *to;
1396	int r = SSH_ERR_INTERNAL_ERROR-1;
1397
1398	if (to_key == NULL((void )0) \|\| (from = from_key->cert) == NULL((void )0))
1399	return SSH_ERR_INVALID_ARGUMENT-10;
1400
1401	if ((to = cert_new()) == NULL((void *)0))
1402	return SSH_ERR_ALLOC_FAIL-2;
1403
1404	if ((r = sshbuf_putb(to->certblob, from->certblob)) != 0 \|\|
1405	(r = sshbuf_putb(to->critical, from->critical)) != 0 \|\|
1406	(r = sshbuf_putb(to->extensions, from->extensions)) != 0)
1407	goto out;
1408
1409	to->serial = from->serial;
1410	to->type = from->type;
1411	if (from->key_id == NULL((void *)0))
1412	to->key_id = NULL((void *)0);
1413	else if ((to->key_id = strdup(from->key_id)) == NULL((void *)0)) {
1414	r = SSH_ERR_ALLOC_FAIL-2;
1415	goto out;
1416	}
1417	to->valid_after = from->valid_after;
1418	to->valid_before = from->valid_before;
1419	if (from->signature_key == NULL((void *)0))
1420	to->signature_key = NULL((void *)0);
1421	else if ((r = sshkey_from_private(from->signature_key,
1422	&to->signature_key)) != 0)
1423	goto out;
1424	if (from->signature_type != NULL((void *)0) &&
1425	(to->signature_type = strdup(from->signature_type)) == NULL((void *)0)) {
1426	r = SSH_ERR_ALLOC_FAIL-2;
1427	goto out;
1428	}
1429	if (from->nprincipals > SSHKEY_CERT_MAX_PRINCIPALS256) {
1430	r = SSH_ERR_INVALID_ARGUMENT-10;
1431	goto out;
1432	}
1433	if (from->nprincipals > 0) {
1434	if ((to->principals = calloc(from->nprincipals,
1435	sizeof(to->principals))) == NULL((void )0)) {
1436	r = SSH_ERR_ALLOC_FAIL-2;
1437	goto out;
1438	}
1439	for (i = 0; i < from->nprincipals; i++) {
1440	to->principals[i] = strdup(from->principals[i]);
1441	if (to->principals[i] == NULL((void *)0)) {
1442	to->nprincipals = i;
1443	r = SSH_ERR_ALLOC_FAIL-2;
1444	goto out;
1445	}
1446	}
1447	}
1448	to->nprincipals = from->nprincipals;
1449
1450	/* success */
1451	cert_free(to_key->cert);
1452	to_key->cert = to;
1453	to = NULL((void *)0);
1454	r = 0;
1455	out:
1456	cert_free(to);
1457	return r;
1458	}
1459
1460	int
1461	sshkey_copy_public_sk(const struct sshkey from, struct sshkey to)
1462	{
1463	/* Append security-key application string */
1464	if ((to->sk_application = strdup(from->sk_application)) == NULL((void *)0))
1465	return SSH_ERR_ALLOC_FAIL-2;
1466	return 0;
1467	}
1468
1469	int
1470	sshkey_from_private(const struct sshkey k, struct sshkey *pkp)
1471	{
1472	struct sshkey n = NULL((void )0);
1473	int r = SSH_ERR_INTERNAL_ERROR-1;
1474	const struct sshkey_impl *impl;
1475
1476	pkp = NULL((void )0);
1477	if ((impl = sshkey_impl_from_key(k)) == NULL((void *)0))
1478	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
1479	if ((n = sshkey_new(k->type)) == NULL((void *)0)) {
1480	r = SSH_ERR_ALLOC_FAIL-2;
1481	goto out;
1482	}
1483	if ((r = impl->funcs->copy_public(k, n)) != 0)
1484	goto out;
1485	if (sshkey_is_cert(k) && (r = sshkey_cert_copy(k, n)) != 0)
1486	goto out;
1487	/* success */
1488	*pkp = n;
1489	n = NULL((void *)0);
1490	r = 0;
1491	out:
1492	sshkey_free(n);
1493	return r;
1494	}
1495
1496	int
1497	sshkey_is_shielded(struct sshkey *k)
1498	{
1499	return k != NULL((void )0) && k->shielded_private != NULL((void )0);
1500	}
1501
1502	int
1503	sshkey_shield_private(struct sshkey *k)
1504	{
1505	struct sshbuf prvbuf = NULL((void )0);
1506	u_char prekey = NULL((void )0), enc = NULL((void )0), keyiv[SSH_DIGEST_MAX_LENGTH64];
1507	struct sshcipher_ctx cctx = NULL((void )0);
1508	const struct sshcipher *cipher;
1509	size_t i, enclen = 0;
1510	struct sshkey kswap = NULL((void )0), tmp;
1511	int r = SSH_ERR_INTERNAL_ERROR-1;
1512
1513	#ifdef DEBUG_PK
1514	fprintf(stderr(&__sF[2]), "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1515	#endif
1516	if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER"aes256-ctr")) == NULL((void *)0)) {
1517	r = SSH_ERR_INVALID_ARGUMENT-10;
1518	goto out;
1519	}
1520	if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1521	ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4)) {
1522	r = SSH_ERR_INTERNAL_ERROR-1;
1523	goto out;
1524	}
1525
1526	/* Prepare a random pre-key, and from it an ephemeral key */
1527	if ((prekey = malloc(SSHKEY_SHIELD_PREKEY_LEN(16 * 1024))) == NULL((void *)0)) {
1528	r = SSH_ERR_ALLOC_FAIL-2;
1529	goto out;
1530	}
1531	arc4random_buf(prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024));
1532	if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH4,
1533	prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024),
1534	keyiv, SSH_DIGEST_MAX_LENGTH64)) != 0)
1535	goto out;
1536	#ifdef DEBUG_PK
1537	fprintf(stderr(&__sF[2]), "%s: key+iv\n", __func__);
1538	sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4),
1539	stderr(&__sF[2]));
1540	#endif
1541	if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1542	keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 1)) != 0)
1543	goto out;
1544
1545	/* Serialise and encrypt the private key using the ephemeral key */
1546	if ((prvbuf = sshbuf_new()) == NULL((void *)0)) {
1547	r = SSH_ERR_ALLOC_FAIL-2;
1548	goto out;
1549	}
1550	if (sshkey_is_shielded(k) && (r = sshkey_unshield_private(k)) != 0)
1551	goto out;
1552	if ((r = sshkey_private_serialize_opt(k, prvbuf,
1553	SSHKEY_SERIALIZE_SHIELD)) != 0)
1554	goto out;
1555	/* pad to cipher blocksize */
1556	i = 0;
1557	while (sshbuf_len(prvbuf) % cipher_blocksize(cipher)) {
1558	if ((r = sshbuf_put_u8(prvbuf, ++i & 0xff)) != 0)
1559	goto out;
1560	}
1561	#ifdef DEBUG_PK
1562	fprintf(stderr(&__sF[2]), "%s: serialised\n", __func__);
1563	sshbuf_dump(prvbuf, stderr(&__sF[2]));
1564	#endif
1565	/* encrypt */
1566	enclen = sshbuf_len(prvbuf);
1567	if ((enc = malloc(enclen)) == NULL((void *)0)) {
1568	r = SSH_ERR_ALLOC_FAIL-2;
1569	goto out;
1570	}
1571	if ((r = cipher_crypt(cctx, 0, enc,
1572	sshbuf_ptr(prvbuf), sshbuf_len(prvbuf), 0, 0)) != 0)
1573	goto out;
1574	#ifdef DEBUG_PK
1575	fprintf(stderr(&__sF[2]), "%s: encrypted\n", __func__);
1576	sshbuf_dump_data(enc, enclen, stderr(&__sF[2]));
1577	#endif
1578
1579	/* Make a scrubbed, public-only copy of our private key argument */
1580	if ((r = sshkey_from_private(k, &kswap)) != 0)
1581	goto out;
1582
1583	/* Swap the private key out (it will be destroyed below) */
1584	tmp = *kswap;
1585	kswap = k;
1586	*k = tmp;
1587
1588	/* Insert the shielded key into our argument */
1589	k->shielded_private = enc;
1590	k->shielded_len = enclen;
1591	k->shield_prekey = prekey;
1592	k->shield_prekey_len = SSHKEY_SHIELD_PREKEY_LEN(16 * 1024);
1593	enc = prekey = NULL((void )0); / transferred */
1594	enclen = 0;
1595
1596	/* preserve key fields that are required for correct operation */
1597	k->sk_flags = kswap->sk_flags;
1598
1599	/* success */
1600	r = 0;
1601
1602	out:
1603	/* XXX behaviour on error - invalidate original private key? */
1604	cipher_free(cctx);
1605	explicit_bzero(keyiv, sizeof(keyiv));
1606	explicit_bzero(&tmp, sizeof(tmp));
1607	freezero(enc, enclen);
1608	freezero(prekey, SSHKEY_SHIELD_PREKEY_LEN(16 * 1024));
1609	sshkey_free(kswap);
1610	sshbuf_free(prvbuf);
1611	return r;
1612	}
1613
1614	/* Check deterministic padding after private key */
1615	static int
1616	private2_check_padding(struct sshbuf *decrypted)
1617	{
1618	u_char pad;
1619	size_t i;
1620	int r;
1621
1622	i = 0;
1623	while (sshbuf_len(decrypted)) {
1624	if ((r = sshbuf_get_u8(decrypted, &pad)) != 0)
1625	goto out;
1626	if (pad != (++i & 0xff)) {
1627	r = SSH_ERR_INVALID_FORMAT-4;
1628	goto out;
1629	}
1630	}
1631	/* success */
1632	r = 0;
1633	out:
1634	explicit_bzero(&pad, sizeof(pad));
1635	explicit_bzero(&i, sizeof(i));
1636	return r;
1637	}
1638
1639	int
1640	sshkey_unshield_private(struct sshkey *k)
1641	{
1642	struct sshbuf prvbuf = NULL((void )0);
1643	u_char *cp, keyiv[SSH_DIGEST_MAX_LENGTH64];
1644	struct sshcipher_ctx cctx = NULL((void )0);
1645	const struct sshcipher *cipher;
1646	struct sshkey kswap = NULL((void )0), tmp;
1647	int r = SSH_ERR_INTERNAL_ERROR-1;
1648
1649	#ifdef DEBUG_PK
1650	fprintf(stderr(&__sF[2]), "%s: entering for %s\n", __func__, sshkey_ssh_name(k));
1651	#endif
1652	if (!sshkey_is_shielded(k))
1653	return 0; /* nothing to do */
1654
1655	if ((cipher = cipher_by_name(SSHKEY_SHIELD_CIPHER"aes256-ctr")) == NULL((void *)0)) {
1656	r = SSH_ERR_INVALID_ARGUMENT-10;
1657	goto out;
1658	}
1659	if (cipher_keylen(cipher) + cipher_ivlen(cipher) >
1660	ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4)) {
1661	r = SSH_ERR_INTERNAL_ERROR-1;
1662	goto out;
1663	}
1664	/* check size of shielded key blob */
1665	if (k->shielded_len < cipher_blocksize(cipher) \|\|
1666	(k->shielded_len % cipher_blocksize(cipher)) != 0) {
1667	r = SSH_ERR_INVALID_FORMAT-4;
1668	goto out;
1669	}
1670
1671	/* Calculate the ephemeral key from the prekey */
1672	if ((r = ssh_digest_memory(SSHKEY_SHIELD_PREKEY_HASH4,
1673	k->shield_prekey, k->shield_prekey_len,
1674	keyiv, SSH_DIGEST_MAX_LENGTH64)) != 0)
1675	goto out;
1676	if ((r = cipher_init(&cctx, cipher, keyiv, cipher_keylen(cipher),
1677	keyiv + cipher_keylen(cipher), cipher_ivlen(cipher), 0)) != 0)
1678	goto out;
1679	#ifdef DEBUG_PK
1680	fprintf(stderr(&__sF[2]), "%s: key+iv\n", __func__);
1681	sshbuf_dump_data(keyiv, ssh_digest_bytes(SSHKEY_SHIELD_PREKEY_HASH4),
1682	stderr(&__sF[2]));
1683	#endif
1684
1685	/* Decrypt and parse the shielded private key using the ephemeral key */
1686	if ((prvbuf = sshbuf_new()) == NULL((void *)0)) {
1687	r = SSH_ERR_ALLOC_FAIL-2;
1688	goto out;
1689	}
1690	if ((r = sshbuf_reserve(prvbuf, k->shielded_len, &cp)) != 0)
1691	goto out;
1692	/* decrypt */
1693	#ifdef DEBUG_PK
1694	fprintf(stderr(&__sF[2]), "%s: encrypted\n", __func__);
1695	sshbuf_dump_data(k->shielded_private, k->shielded_len, stderr(&__sF[2]));
1696	#endif
1697	if ((r = cipher_crypt(cctx, 0, cp,
1698	k->shielded_private, k->shielded_len, 0, 0)) != 0)
1699	goto out;
1700	#ifdef DEBUG_PK
1701	fprintf(stderr(&__sF[2]), "%s: serialised\n", __func__);
1702	sshbuf_dump(prvbuf, stderr(&__sF[2]));
1703	#endif
1704	/* Parse private key */
1705	if ((r = sshkey_private_deserialize(prvbuf, &kswap)) != 0)
1706	goto out;
1707
1708	if ((r = private2_check_padding(prvbuf)) != 0)
1709	goto out;
1710
1711	/* Swap the parsed key back into place */
1712	tmp = *kswap;
1713	kswap = k;
1714	*k = tmp;
1715
1716	/* success */
1717	r = 0;
1718
1719	out:
1720	cipher_free(cctx);
1721	explicit_bzero(keyiv, sizeof(keyiv));
1722	explicit_bzero(&tmp, sizeof(tmp));
1723	sshkey_free(kswap);
1724	sshbuf_free(prvbuf);
1725	return r;
1726	}
1727
1728	static int
1729	cert_parse(struct sshbuf b, struct sshkey key, struct sshbuf *certbuf)
1730	{
1731	struct sshbuf principals = NULL((void )0), crit = NULL((void )0);
1732	struct sshbuf exts = NULL((void )0), ca = NULL((void )0);
1733	u_char sig = NULL((void )0);
1734	size_t signed_len = 0, slen = 0, kidlen = 0;
1735	int ret = SSH_ERR_INTERNAL_ERROR-1;
1736
1737	/* Copy the entire key blob for verification and later serialisation */
1738	if ((ret = sshbuf_putb(key->cert->certblob, certbuf)) != 0)
1739	return ret;
1740
1741	/* Parse body of certificate up to signature */
1742	if ((ret = sshbuf_get_u64(b, &key->cert->serial)) != 0 \|\|
1743	(ret = sshbuf_get_u32(b, &key->cert->type)) != 0 \|\|
1744	(ret = sshbuf_get_cstring(b, &key->cert->key_id, &kidlen)) != 0 \|\|
1745	(ret = sshbuf_froms(b, &principals)) != 0 \|\|
1746	(ret = sshbuf_get_u64(b, &key->cert->valid_after)) != 0 \|\|
1747	(ret = sshbuf_get_u64(b, &key->cert->valid_before)) != 0 \|\|
1748	(ret = sshbuf_froms(b, &crit)) != 0 \|\|
1749	(ret = sshbuf_froms(b, &exts)) != 0 \|\|
1750	(ret = sshbuf_get_string_direct(b, NULL((void )0), NULL((void )0))) != 0 \|\|
1751	(ret = sshbuf_froms(b, &ca)) != 0) {
	Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret'
1752	/* XXX debug print error for ret */
1753	ret = SSH_ERR_INVALID_FORMAT-4;
1754	goto out;
1755	}
1756
1757	/* Signature is left in the buffer so we can calculate this length */
1758	signed_len = sshbuf_len(key->cert->certblob) - sshbuf_len(b);
1759
1760	if ((ret = sshbuf_get_string(b, &sig, &slen)) != 0) {
1761	ret = SSH_ERR_INVALID_FORMAT-4;
1762	goto out;
1763	}
1764
1765	if (key->cert->type != SSH2_CERT_TYPE_USER1 &&
1766	key->cert->type != SSH2_CERT_TYPE_HOST2) {
1767	ret = SSH_ERR_KEY_CERT_UNKNOWN_TYPE-18;
1768	goto out;
1769	}
1770
1771	/* Parse principals section */
1772	while (sshbuf_len(principals) > 0) {
1773	char principal = NULL((void )0);
1774	char *oprincipals = NULL((void )0);
1775
1776	if (key->cert->nprincipals >= SSHKEY_CERT_MAX_PRINCIPALS256) {
1777	ret = SSH_ERR_INVALID_FORMAT-4;
1778	goto out;
1779	}
1780	if ((ret = sshbuf_get_cstring(principals, &principal,
1781	NULL((void *)0))) != 0) {
1782	ret = SSH_ERR_INVALID_FORMAT-4;
1783	goto out;
1784	}
1785	oprincipals = key->cert->principals;
1786	key->cert->principals = recallocarray(key->cert->principals,
1787	key->cert->nprincipals, key->cert->nprincipals + 1,
1788	sizeof(*key->cert->principals));
1789	if (key->cert->principals == NULL((void *)0)) {
1790	free(principal);
1791	key->cert->principals = oprincipals;
1792	ret = SSH_ERR_ALLOC_FAIL-2;
1793	goto out;
1794	}
1795	key->cert->principals[key->cert->nprincipals++] = principal;
1796	}
1797
1798	/*
1799	* Stash a copies of the critical options and extensions sections
1800	* for later use.
1801	*/
1802	if ((ret = sshbuf_putb(key->cert->critical, crit)) != 0 \|\|
1803	(exts != NULL((void *)0) &&
1804	(ret = sshbuf_putb(key->cert->extensions, exts)) != 0))
1805	goto out;
1806
1807	/*
1808	* Validate critical options and extensions sections format.
1809	*/
1810	while (sshbuf_len(crit) != 0) {
1811	if ((ret = sshbuf_get_string_direct(crit, NULL((void )0), NULL((void )0))) != 0 \|\|
1812	(ret = sshbuf_get_string_direct(crit, NULL((void )0), NULL((void )0))) != 0) {
1813	sshbuf_reset(key->cert->critical);
1814	ret = SSH_ERR_INVALID_FORMAT-4;
1815	goto out;
1816	}
1817	}
1818	while (exts != NULL((void *)0) && sshbuf_len(exts) != 0) {
1819	if ((ret = sshbuf_get_string_direct(exts, NULL((void )0), NULL((void )0))) != 0 \|\|
1820	(ret = sshbuf_get_string_direct(exts, NULL((void )0), NULL((void )0))) != 0) {
1821	sshbuf_reset(key->cert->extensions);
1822	ret = SSH_ERR_INVALID_FORMAT-4;
1823	goto out;
1824	}
1825	}
1826
1827	/* Parse CA key and check signature */
1828	if (sshkey_from_blob_internal(ca, &key->cert->signature_key, 0) != 0) {
1829	ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19;
1830	goto out;
1831	}
1832	if (!sshkey_type_is_valid_ca(key->cert->signature_key->type)) {
1833	ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19;
1834	goto out;
1835	}
1836	if ((ret = sshkey_verify(key->cert->signature_key, sig, slen,
1837	sshbuf_ptr(key->cert->certblob), signed_len, NULL((void )0), 0, NULL((void )0))) != 0)
1838	goto out;
1839	if ((ret = sshkey_get_sigtype(sig, slen,
1840	&key->cert->signature_type)) != 0)
1841	goto out;
1842
1843	/* Success */
1844	ret = 0;
1845	out:
1846	sshbuf_free(ca);
1847	sshbuf_free(crit);
1848	sshbuf_free(exts);
1849	sshbuf_free(principals);
1850	free(sig);
1851	return ret;
1852	}
1853
1854	int
1855	sshkey_deserialize_sk(struct sshbuf b, struct sshkey key)
1856	{
1857	/* Parse additional security-key application string */
1858	if (sshbuf_get_cstring(b, &key->sk_application, NULL((void *)0)) != 0)
1859	return SSH_ERR_INVALID_FORMAT-4;
1860	return 0;
1861	}
1862
1863	static int
1864	sshkey_from_blob_internal(struct sshbuf b, struct sshkey *keyp,
1865	int allow_cert)
1866	{
1867	int type, ret = SSH_ERR_INTERNAL_ERROR-1;
1868	char ktype = NULL((void )0);
1869	struct sshkey key = NULL((void )0);
1870	struct sshbuf *copy;
1871	const struct sshkey_impl *impl;
1872
1873	#ifdef DEBUG_PK /* XXX */
1874	sshbuf_dump(b, stderr(&__sF[2]));
1875	#endif
1876	if (keyp != NULL((void *)0))
1877	keyp = NULL((void )0);
1878	if ((copy = sshbuf_fromb(b)) == NULL((void *)0)) {
1879	ret = SSH_ERR_ALLOC_FAIL-2;
1880	goto out;
1881	}
1882	if (sshbuf_get_cstring(b, &ktype, NULL((void *)0)) != 0) {
1883	ret = SSH_ERR_INVALID_FORMAT-4;
1884	goto out;
1885	}
1886
1887	type = sshkey_type_from_name(ktype);
1888	if (!allow_cert && sshkey_type_is_cert(type)) {
1889	ret = SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19;
1890	goto out;
1891	}
1892	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0)) {
1893	ret = SSH_ERR_KEY_TYPE_UNKNOWN-14;
1894	goto out;
1895	}
1896	if ((key = sshkey_new(type)) == NULL((void *)0)) {
1897	ret = SSH_ERR_ALLOC_FAIL-2;
1898	goto out;
1899	}
1900	if (sshkey_type_is_cert(type)) {
1901	/* Skip nonce that precedes all certificates */
1902	if (sshbuf_get_string_direct(b, NULL((void )0), NULL((void )0)) != 0) {
1903	ret = SSH_ERR_INVALID_FORMAT-4;
1904	goto out;
1905	}
1906	}
1907	if ((ret = impl->funcs->deserialize_public(ktype, b, key)) != 0)
1908	goto out;
1909
1910	/* Parse certificate potion */
1911	if (sshkey_is_cert(key) && (ret = cert_parse(b, key, copy)) != 0)
1912	goto out;
1913
1914	if (key != NULL((void *)0) && sshbuf_len(b) != 0) {
1915	ret = SSH_ERR_INVALID_FORMAT-4;
1916	goto out;
1917	}
1918	ret = 0;
1919	if (keyp != NULL((void *)0)) {
1920	*keyp = key;
1921	key = NULL((void *)0);
1922	}
1923	out:
1924	sshbuf_free(copy);
1925	sshkey_free(key);
1926	free(ktype);
1927	return ret;
1928	}
1929
1930	int
1931	sshkey_from_blob(const u_char blob, size_t blen, struct sshkey *keyp)
1932	{
1933	struct sshbuf *b;
1934	int r;
1935
1936	if ((b = sshbuf_from(blob, blen)) == NULL((void *)0))
1937	return SSH_ERR_ALLOC_FAIL-2;
1938	r = sshkey_from_blob_internal(b, keyp, 1);
1939	sshbuf_free(b);
1940	return r;
1941	}
1942
1943	int
1944	sshkey_fromb(struct sshbuf b, struct sshkey *keyp)
1945	{
1946	return sshkey_from_blob_internal(b, keyp, 1);
1947	}
1948
1949	int
1950	sshkey_froms(struct sshbuf buf, struct sshkey *keyp)
1951	{
1952	struct sshbuf *b;
1953	int r;
1954
1955	if ((r = sshbuf_froms(buf, &b)) != 0)
1956	return r;
1957	r = sshkey_from_blob_internal(b, keyp, 1);
1958	sshbuf_free(b);
1959	return r;
1960	}
1961
1962	int
1963	sshkey_get_sigtype(const u_char sig, size_t siglen, char *sigtypep)
1964	{
1965	int r;
1966	struct sshbuf b = NULL((void )0);
1967	char sigtype = NULL((void )0);
1968
1969	if (sigtypep != NULL((void *)0))
1970	sigtypep = NULL((void )0);
1971	if ((b = sshbuf_from(sig, siglen)) == NULL((void *)0))
1972	return SSH_ERR_ALLOC_FAIL-2;
1973	if ((r = sshbuf_get_cstring(b, &sigtype, NULL((void *)0))) != 0)
1974	goto out;
1975	/* success */
1976	if (sigtypep != NULL((void *)0)) {
1977	*sigtypep = sigtype;
1978	sigtype = NULL((void *)0);
1979	}
1980	r = 0;
1981	out:
1982	free(sigtype);
1983	sshbuf_free(b);
1984	return r;
1985	}
1986
1987	/*
1988	*
1989	* Checks whether a certificate's signature type is allowed.
1990	* Returns 0 (success) if the certificate signature type appears in the
1991	* "allowed" pattern-list, or the key is not a certificate to begin with.
1992	* Otherwise returns a ssherr.h code.
1993	*/
1994	int
1995	sshkey_check_cert_sigtype(const struct sshkey key, const char allowed)
1996	{
1997	if (key == NULL((void )0) \|\| allowed == NULL((void )0))
1998	return SSH_ERR_INVALID_ARGUMENT-10;
1999	if (!sshkey_type_is_cert(key->type))
2000	return 0;
2001	if (key->cert == NULL((void )0) \|\| key->cert->signature_type == NULL((void )0))
2002	return SSH_ERR_INVALID_ARGUMENT-10;
2003	if (match_pattern_list(key->cert->signature_type, allowed, 0) != 1)
2004	return SSH_ERR_SIGN_ALG_UNSUPPORTED-58;
2005	return 0;
2006	}
2007
2008	/*
2009	* Returns the expected signature algorithm for a given public key algorithm.
2010	*/
2011	const char *
2012	sshkey_sigalg_by_name(const char *name)
2013	{
2014	const struct sshkey_impl *impl;
2015	int i;
2016
2017	for (i = 0; keyimpls[i] != NULL((void *)0); i++) {
2018	impl = keyimpls[i];
2019	if (strcmp(impl->name, name) != 0)
2020	continue;
2021	if (impl->sigalg != NULL((void *)0))
2022	return impl->sigalg;
2023	if (!impl->cert)
2024	return impl->name;
2025	return sshkey_ssh_name_from_type_nid(
2026	sshkey_type_plain(impl->type), impl->nid);
2027	}
2028	return NULL((void *)0);
2029	}
2030
2031	/*
2032	* Verifies that the signature algorithm appearing inside the signature blob
2033	* matches that which was requested.
2034	*/
2035	int
2036	sshkey_check_sigtype(const u_char *sig, size_t siglen,
2037	const char *requested_alg)
2038	{
2039	const char *expected_alg;
2040	char sigtype = NULL((void )0);
2041	int r;
2042
2043	if (requested_alg == NULL((void *)0))
2044	return 0;
2045	if ((expected_alg = sshkey_sigalg_by_name(requested_alg)) == NULL((void *)0))
2046	return SSH_ERR_INVALID_ARGUMENT-10;
2047	if ((r = sshkey_get_sigtype(sig, siglen, &sigtype)) != 0)
2048	return r;
2049	r = strcmp(expected_alg, sigtype) == 0;
2050	free(sigtype);
2051	return r ? 0 : SSH_ERR_SIGN_ALG_UNSUPPORTED-58;
2052	}
2053
2054	int
2055	sshkey_sign(struct sshkey *key,
2056	u_char *sigp, size_t lenp,
2057	const u_char *data, size_t datalen,
2058	const char alg, const char sk_provider, const char *sk_pin, u_int compat)
2059	{
2060	int was_shielded = sshkey_is_shielded(key);
2061	int r2, r = SSH_ERR_INTERNAL_ERROR-1;
2062	const struct sshkey_impl *impl;
2063
2064	if (sigp != NULL((void *)0))
2065	sigp = NULL((void )0);
2066	if (lenp != NULL((void *)0))
2067	*lenp = 0;
2068	if (datalen > SSH_KEY_MAX_SIGN_DATA_SIZE(1 << 20))
2069	return SSH_ERR_INVALID_ARGUMENT-10;
2070	if ((impl = sshkey_impl_from_key(key)) == NULL((void *)0))
2071	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
2072	if ((r = sshkey_unshield_private(key)) != 0)
2073	return r;
2074	if (sshkey_is_sk(key)) {
2075	r = sshsk_sign(sk_provider, key, sigp, lenp, data,
2076	datalen, compat, sk_pin);
2077	} else {
2078	if (impl->funcs->sign == NULL((void *)0))
2079	r = SSH_ERR_SIGN_ALG_UNSUPPORTED-58;
2080	else {
2081	r = impl->funcs->sign(key, sigp, lenp, data, datalen,
2082	alg, sk_provider, sk_pin, compat);
2083	}
2084	}
2085	if (was_shielded && (r2 = sshkey_shield_private(key)) != 0)
2086	return r2;
2087	return r;
2088	}
2089
2090	/*
2091	* ssh_key_verify returns 0 for a correct signature and < 0 on error.
2092	* If "alg" specified, then the signature must use that algorithm.
2093	*/
2094	int
2095	sshkey_verify(const struct sshkey *key,
2096	const u_char *sig, size_t siglen,
2097	const u_char data, size_t dlen, const char alg, u_int compat,
2098	struct sshkey_sig_details **detailsp)
2099	{
2100	const struct sshkey_impl *impl;
2101
2102	if (detailsp != NULL((void *)0))
2103	detailsp = NULL((void )0);
2104	if (siglen == 0 \|\| dlen > SSH_KEY_MAX_SIGN_DATA_SIZE(1 << 20))
2105	return SSH_ERR_INVALID_ARGUMENT-10;
2106	if ((impl = sshkey_impl_from_key(key)) == NULL((void *)0))
2107	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
2108	return impl->funcs->verify(key, sig, siglen, data, dlen,
2109	alg, compat, detailsp);
2110	}
2111
2112	/* Convert a plain key to their _CERT equivalent */
2113	int
2114	sshkey_to_certified(struct sshkey *k)
2115	{
2116	int newtype;
2117
2118	if ((newtype = sshkey_type_certified(k->type)) == -1)
2119	return SSH_ERR_INVALID_ARGUMENT-10;
2120	if ((k->cert = cert_new()) == NULL((void *)0))
2121	return SSH_ERR_ALLOC_FAIL-2;
2122	k->type = newtype;
2123	return 0;
2124	}
2125
2126	/* Convert a certificate to its raw key equivalent */
2127	int
2128	sshkey_drop_cert(struct sshkey *k)
2129	{
2130	if (!sshkey_type_is_cert(k->type))
2131	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
2132	cert_free(k->cert);
2133	k->cert = NULL((void *)0);
2134	k->type = sshkey_type_plain(k->type);
2135	return 0;
2136	}
2137
2138	/* Sign a certified key, (re-)generating the signed certblob. */
2139	int
2140	sshkey_certify_custom(struct sshkey k, struct sshkey ca, const char *alg,
2141	const char sk_provider, const char sk_pin,
2142	sshkey_certify_signer signer, void signer_ctx)
2143	{
2144	const struct sshkey_impl *impl;
2145	struct sshbuf principals = NULL((void )0);
2146	u_char ca_blob = NULL((void )0), sig_blob = NULL((void )0), nonce[32];
2147	size_t i, ca_len, sig_len;
2148	int ret = SSH_ERR_INTERNAL_ERROR-1;
2149	struct sshbuf cert = NULL((void )0);
2150	char sigtype = NULL((void )0);
2151
2152	if (k == NULL((void )0) \|\| k->cert == NULL((void )0) \|\|
2153	k->cert->certblob == NULL((void )0) \|\| ca == NULL((void )0))
2154	return SSH_ERR_INVALID_ARGUMENT-10;
2155	if (!sshkey_is_cert(k))
2156	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
2157	if (!sshkey_type_is_valid_ca(ca->type))
2158	return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19;
2159	if ((impl = sshkey_impl_from_key(k)) == NULL((void *)0))
2160	return SSH_ERR_INTERNAL_ERROR-1;
2161
2162	/*
2163	* If no alg specified as argument but a signature_type was set,
2164	* then prefer that. If both were specified, then they must match.
2165	*/
2166	if (alg == NULL((void *)0))
2167	alg = k->cert->signature_type;
2168	else if (k->cert->signature_type != NULL((void *)0) &&
2169	strcmp(alg, k->cert->signature_type) != 0)
2170	return SSH_ERR_INVALID_ARGUMENT-10;
2171
2172	/*
2173	* If no signing algorithm or signature_type was specified and we're
2174	* using a RSA key, then default to a good signature algorithm.
2175	*/
2176	if (alg == NULL((void *)0) && ca->type == KEY_RSA)
2177	alg = "rsa-sha2-512";
2178
2179	if ((ret = sshkey_to_blob(ca, &ca_blob, &ca_len)) != 0)
2180	return SSH_ERR_KEY_CERT_INVALID_SIGN_KEY-19;
2181
2182	cert = k->cert->certblob; /* for readability */
2183	sshbuf_reset(cert);
2184	if ((ret = sshbuf_put_cstring(cert, sshkey_ssh_name(k))) != 0)
2185	goto out;
2186
2187	/* -v01 certs put nonce first */
2188	arc4random_buf(&nonce, sizeof(nonce));
2189	if ((ret = sshbuf_put_string(cert, nonce, sizeof(nonce))) != 0)
2190	goto out;
2191
2192	/* Public key next */
2193	if ((ret = impl->funcs->serialize_public(k, cert,
2194	SSHKEY_SERIALIZE_DEFAULT)) != 0)
2195	goto out;
2196
2197	/* Then remaining cert fields */
2198	if ((ret = sshbuf_put_u64(cert, k->cert->serial)) != 0 \|\|
2199	(ret = sshbuf_put_u32(cert, k->cert->type)) != 0 \|\|
2200	(ret = sshbuf_put_cstring(cert, k->cert->key_id)) != 0)
2201	goto out;
2202
2203	if ((principals = sshbuf_new()) == NULL((void *)0)) {
2204	ret = SSH_ERR_ALLOC_FAIL-2;
2205	goto out;
2206	}
2207	for (i = 0; i < k->cert->nprincipals; i++) {
2208	if ((ret = sshbuf_put_cstring(principals,
2209	k->cert->principals[i])) != 0)
2210	goto out;
2211	}
2212	if ((ret = sshbuf_put_stringb(cert, principals)) != 0 \|\|
2213	(ret = sshbuf_put_u64(cert, k->cert->valid_after)) != 0 \|\|
2214	(ret = sshbuf_put_u64(cert, k->cert->valid_before)) != 0 \|\|
2215	(ret = sshbuf_put_stringb(cert, k->cert->critical)) != 0 \|\|
2216	(ret = sshbuf_put_stringb(cert, k->cert->extensions)) != 0 \|\|
2217	(ret = sshbuf_put_string(cert, NULL((void )0), 0)) != 0 \|\| / Reserved */
2218	(ret = sshbuf_put_string(cert, ca_blob, ca_len)) != 0)
2219	goto out;
2220
2221	/* Sign the whole mess */
2222	if ((ret = signer(ca, &sig_blob, &sig_len, sshbuf_ptr(cert),
2223	sshbuf_len(cert), alg, sk_provider, sk_pin, 0, signer_ctx)) != 0)
2224	goto out;
2225	/* Check and update signature_type against what was actually used */
2226	if ((ret = sshkey_get_sigtype(sig_blob, sig_len, &sigtype)) != 0)
2227	goto out;
2228	if (alg != NULL((void *)0) && strcmp(alg, sigtype) != 0) {
2229	ret = SSH_ERR_SIGN_ALG_UNSUPPORTED-58;
2230	goto out;
2231	}
2232	if (k->cert->signature_type == NULL((void *)0)) {
2233	k->cert->signature_type = sigtype;
2234	sigtype = NULL((void *)0);
2235	}
2236	/* Append signature and we are done */
2237	if ((ret = sshbuf_put_string(cert, sig_blob, sig_len)) != 0)
2238	goto out;
2239	ret = 0;
2240	out:
2241	if (ret != 0)
2242	sshbuf_reset(cert);
2243	free(sig_blob);
2244	free(ca_blob);
2245	free(sigtype);
2246	sshbuf_free(principals);
2247	return ret;
2248	}
2249
2250	static int
2251	default_key_sign(struct sshkey key, u_char sigp, size_t lenp,
2252	const u_char *data, size_t datalen,
2253	const char alg, const char sk_provider, const char *sk_pin,
2254	u_int compat, void *ctx)
2255	{
2256	if (ctx != NULL((void *)0))
2257	return SSH_ERR_INVALID_ARGUMENT-10;
2258	return sshkey_sign(key, sigp, lenp, data, datalen, alg,
2259	sk_provider, sk_pin, compat);
2260	}
2261
2262	int
2263	sshkey_certify(struct sshkey k, struct sshkey ca, const char *alg,
2264	const char sk_provider, const char sk_pin)
2265	{
2266	return sshkey_certify_custom(k, ca, alg, sk_provider, sk_pin,
2267	default_key_sign, NULL((void *)0));
2268	}
2269
2270	int
2271	sshkey_cert_check_authority(const struct sshkey *k,
2272	int want_host, int require_principal, int wildcard_pattern,
2273	uint64_t verify_time, const char name, const char *reason)
2274	{
2275	u_int i, principal_matches;
2276
2277	if (reason == NULL((void *)0))
2278	return SSH_ERR_INVALID_ARGUMENT-10;
2279	if (!sshkey_is_cert(k)) {
2280	*reason = "Key is not a certificate";
2281	return SSH_ERR_KEY_CERT_INVALID-25;
2282	}
2283	if (want_host) {
2284	if (k->cert->type != SSH2_CERT_TYPE_HOST2) {
2285	*reason = "Certificate invalid: not a host certificate";
2286	return SSH_ERR_KEY_CERT_INVALID-25;
2287	}
2288	} else {
2289	if (k->cert->type != SSH2_CERT_TYPE_USER1) {
2290	*reason = "Certificate invalid: not a user certificate";
2291	return SSH_ERR_KEY_CERT_INVALID-25;
2292	}
2293	}
2294	if (verify_time < k->cert->valid_after) {
2295	*reason = "Certificate invalid: not yet valid";
2296	return SSH_ERR_KEY_CERT_INVALID-25;
2297	}
2298	if (verify_time >= k->cert->valid_before) {
2299	*reason = "Certificate invalid: expired";
2300	return SSH_ERR_KEY_CERT_INVALID-25;
2301	}
2302	if (k->cert->nprincipals == 0) {
2303	if (require_principal) {
2304	*reason = "Certificate lacks principal list";
2305	return SSH_ERR_KEY_CERT_INVALID-25;
2306	}
2307	} else if (name != NULL((void *)0)) {
2308	principal_matches = 0;
2309	for (i = 0; i < k->cert->nprincipals; i++) {
2310	if (wildcard_pattern) {
2311	if (match_pattern(k->cert->principals[i],
2312	name)) {
2313	principal_matches = 1;
2314	break;
2315	}
2316	} else if (strcmp(name, k->cert->principals[i]) == 0) {
2317	principal_matches = 1;
2318	break;
2319	}
2320	}
2321	if (!principal_matches) {
2322	*reason = "Certificate invalid: name is not a listed "
2323	"principal";
2324	return SSH_ERR_KEY_CERT_INVALID-25;
2325	}
2326	}
2327	return 0;
2328	}
2329
2330	int
2331	sshkey_cert_check_authority_now(const struct sshkey *k,
2332	int want_host, int require_principal, int wildcard_pattern,
2333	const char name, const char *reason)
2334	{
2335	time_t now;
2336
2337	if ((now = time(NULL((void *)0))) < 0) {
2338	/* yikes - system clock before epoch! */
2339	*reason = "Certificate invalid: not yet valid";
2340	return SSH_ERR_KEY_CERT_INVALID-25;
2341	}
2342	return sshkey_cert_check_authority(k, want_host, require_principal,
2343	wildcard_pattern, (uint64_t)now, name, reason);
2344	}
2345
2346	int
2347	sshkey_cert_check_host(const struct sshkey key, const char host,
2348	int wildcard_principals, const char *ca_sign_algorithms,
2349	const char **reason)
2350	{
2351	int r;
2352
2353	if ((r = sshkey_cert_check_authority_now(key, 1, 0, wildcard_principals,
2354	host, reason)) != 0)
2355	return r;
2356	if (sshbuf_len(key->cert->critical) != 0) {
2357	*reason = "Certificate contains unsupported critical options";
2358	return SSH_ERR_KEY_CERT_INVALID-25;
2359	}
2360	if (ca_sign_algorithms != NULL((void *)0) &&
2361	(r = sshkey_check_cert_sigtype(key, ca_sign_algorithms)) != 0) {
2362	*reason = "Certificate signed with disallowed algorithm";
2363	return SSH_ERR_KEY_CERT_INVALID-25;
2364	}
2365	return 0;
2366	}
2367
2368	size_t
2369	sshkey_format_cert_validity(const struct sshkey_cert cert, char s, size_t l)
2370	{
2371	char from[32], to[32], ret[128];
2372
2373	from = to = '\0';
2374	if (cert->valid_after == 0 &&
2375	cert->valid_before == 0xffffffffffffffffULL)
2376	return strlcpy(s, "forever", l);
2377
2378	if (cert->valid_after != 0)
2379	format_absolute_time(cert->valid_after, from, sizeof(from));
2380	if (cert->valid_before != 0xffffffffffffffffULL)
2381	format_absolute_time(cert->valid_before, to, sizeof(to));
2382
2383	if (cert->valid_after == 0)
2384	snprintf(ret, sizeof(ret), "before %s", to);
2385	else if (cert->valid_before == 0xffffffffffffffffULL)
2386	snprintf(ret, sizeof(ret), "after %s", from);
2387	else
2388	snprintf(ret, sizeof(ret), "from %s to %s", from, to);
2389
2390	return strlcpy(s, ret, l);
2391	}
2392
2393	/* Common serialization for FIDO private keys */
2394	int
2395	sshkey_serialize_private_sk(const struct sshkey key, struct sshbuf b)
2396	{
2397	int r;
2398
2399	if ((r = sshbuf_put_cstring(b, key->sk_application)) != 0 \|\|
2400	(r = sshbuf_put_u8(b, key->sk_flags)) != 0 \|\|
2401	(r = sshbuf_put_stringb(b, key->sk_key_handle)) != 0 \|\|
2402	(r = sshbuf_put_stringb(b, key->sk_reserved)) != 0)
2403	return r;
2404
2405	return 0;
2406	}
2407
2408	int
2409	sshkey_private_serialize_opt(struct sshkey key, struct sshbuf buf,
2410	enum sshkey_serialize_rep opts)
2411	{
2412	int r = SSH_ERR_INTERNAL_ERROR-1;
2413	int was_shielded = sshkey_is_shielded(key);
2414	struct sshbuf b = NULL((void )0);
2415	const struct sshkey_impl *impl;
2416
2417	if ((impl = sshkey_impl_from_key(key)) == NULL((void *)0))
2418	return SSH_ERR_INTERNAL_ERROR-1;
2419	if ((r = sshkey_unshield_private(key)) != 0)
2420	return r;
2421	if ((b = sshbuf_new()) == NULL((void *)0))
2422	return SSH_ERR_ALLOC_FAIL-2;
2423	if ((r = sshbuf_put_cstring(b, sshkey_ssh_name(key))) != 0)
2424	goto out;
2425	if (sshkey_is_cert(key)) {
2426	if (key->cert == NULL((void *)0) \|\|
2427	sshbuf_len(key->cert->certblob) == 0) {
2428	r = SSH_ERR_INVALID_ARGUMENT-10;
2429	goto out;
2430	}
2431	if ((r = sshbuf_put_stringb(b, key->cert->certblob)) != 0)
2432	goto out;
2433	}
2434	if ((r = impl->funcs->serialize_private(key, b, opts)) != 0)
2435	goto out;
2436
2437	/*
2438	* success (but we still need to append the output to buf after
2439	* possibly re-shielding the private key)
2440	*/
2441	r = 0;
2442	out:
2443	if (was_shielded)
2444	r = sshkey_shield_private(key);
2445	if (r == 0)
2446	r = sshbuf_putb(buf, b);
2447	sshbuf_free(b);
2448
2449	return r;
2450	}
2451
2452	int
2453	sshkey_private_serialize(struct sshkey key, struct sshbuf b)
2454	{
2455	return sshkey_private_serialize_opt(key, b,
2456	SSHKEY_SERIALIZE_DEFAULT);
2457	}
2458
2459	/* Shared deserialization of FIDO private key components */
2460	int
2461	sshkey_private_deserialize_sk(struct sshbuf buf, struct sshkey k)
2462	{
2463	int r;
2464
2465	if ((k->sk_key_handle = sshbuf_new()) == NULL((void *)0) \|\|
2466	(k->sk_reserved = sshbuf_new()) == NULL((void *)0))
2467	return SSH_ERR_ALLOC_FAIL-2;
2468	if ((r = sshbuf_get_cstring(buf, &k->sk_application, NULL((void *)0))) != 0 \|\|
2469	(r = sshbuf_get_u8(buf, &k->sk_flags)) != 0 \|\|
2470	(r = sshbuf_get_stringb(buf, k->sk_key_handle)) != 0 \|\|
2471	(r = sshbuf_get_stringb(buf, k->sk_reserved)) != 0)
2472	return r;
2473
2474	return 0;
2475	}
2476
2477	int
2478	sshkey_private_deserialize(struct sshbuf buf, struct sshkey *kp)
2479	{
2480	const struct sshkey_impl *impl;
2481	char tname = NULL((void )0);
2482	char expect_sk_application = NULL((void )0);
2483	u_char expect_ed25519_pk = NULL((void )0);
2484	struct sshkey k = NULL((void )0);
2485	int type, r = SSH_ERR_INTERNAL_ERROR-1;
2486
2487	if (kp != NULL((void *)0))
2488	kp = NULL((void )0);
2489	if ((r = sshbuf_get_cstring(buf, &tname, NULL((void *)0))) != 0)
2490	goto out;
2491	type = sshkey_type_from_name(tname);
2492	if (sshkey_type_is_cert(type)) {
2493	/*
2494	* Certificate key private keys begin with the certificate
2495	* itself. Make sure this matches the type of the enclosing
2496	* private key.
2497	*/
2498	if ((r = sshkey_froms(buf, &k)) != 0)
2499	goto out;
2500	if (k->type != type) {
2501	r = SSH_ERR_KEY_CERT_MISMATCH-45;
2502	goto out;
2503	}
2504	/* For ECDSA keys, the group must match too */
2505	if (k->type == KEY_ECDSA &&
2506	k->ecdsa_nid != sshkey_ecdsa_nid_from_name(tname)) {
2507	r = SSH_ERR_KEY_CERT_MISMATCH-45;
2508	goto out;
2509	}
2510	/*
2511	* Several fields are redundant between certificate and
2512	* private key body, we require these to match.
2513	*/
2514	expect_sk_application = k->sk_application;
2515	expect_ed25519_pk = k->ed25519_pk;
2516	k->sk_application = NULL((void *)0);
2517	k->ed25519_pk = NULL((void *)0);
2518	/* XXX xmss too or refactor */
2519	} else {
2520	if ((k = sshkey_new(type)) == NULL((void *)0)) {
2521	r = SSH_ERR_ALLOC_FAIL-2;
2522	goto out;
2523	}
2524	}
2525	if ((impl = sshkey_impl_from_type(type)) == NULL((void *)0)) {
2526	r = SSH_ERR_INTERNAL_ERROR-1;
2527	goto out;
2528	}
2529	if ((r = impl->funcs->deserialize_private(tname, buf, k)) != 0)
2530	goto out;
2531
2532	/* XXX xmss too or refactor */
2533	if ((expect_sk_application != NULL((void )0) && (k->sk_application == NULL((void )0) \|\|
2534	strcmp(expect_sk_application, k->sk_application) != 0)) \|\|
2535	(expect_ed25519_pk != NULL((void )0) && (k->ed25519_pk == NULL((void )0) \|\|
2536	memcmp(expect_ed25519_pk, k->ed25519_pk, ED25519_PK_SZ32U) != 0))) {
2537	r = SSH_ERR_KEY_CERT_MISMATCH-45;
2538	goto out;
2539	}
2540	/* success */
2541	r = 0;
2542	if (kp != NULL((void *)0)) {
2543	*kp = k;
2544	k = NULL((void *)0);
2545	}
2546	out:
2547	free(tname);
2548	sshkey_free(k);
2549	free(expect_sk_application);
2550	free(expect_ed25519_pk);
2551	return r;
2552	}
2553
2554	#ifdef WITH_OPENSSL1
2555	int
2556	sshkey_ec_validate_public(const EC_GROUP group, const EC_POINT public)
2557	{
2558	EC_POINT nq = NULL((void )0);
2559	BIGNUM order = NULL((void )0), x = NULL((void )0), y = NULL((void )0), tmp = NULL((void )0);
2560	int ret = SSH_ERR_KEY_INVALID_EC_VALUE-20;
2561
2562	/*
2563	* NB. This assumes OpenSSL has already verified that the public
2564	* point lies on the curve. This is done by EC_POINT_oct2point()
2565	* implicitly calling EC_POINT_is_on_curve(). If this code is ever
2566	* reachable with public points not unmarshalled using
2567	* EC_POINT_oct2point then the caller will need to explicitly check.
2568	*/
2569
2570	/*
2571	* We shouldn't ever hit this case because bignum_get_ecpoint()
2572	* refuses to load GF2m points.
2573	*/
2574	if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2575	NID_X9_62_prime_field406)
2576	goto out;
2577
2578	/* Q != infinity */
2579	if (EC_POINT_is_at_infinity(group, public))
2580	goto out;
2581
2582	if ((x = BN_new()) == NULL((void *)0) \|\|
2583	(y = BN_new()) == NULL((void *)0) \|\|
2584	(order = BN_new()) == NULL((void *)0) \|\|
2585	(tmp = BN_new()) == NULL((void *)0)) {
2586	ret = SSH_ERR_ALLOC_FAIL-2;
2587	goto out;
2588	}
2589
2590	/* log2(x) > log2(order)/2, log2(y) > log2(order)/2 */
2591	if (EC_GROUP_get_order(group, order, NULL((void *)0)) != 1 \|\|
2592	EC_POINT_get_affine_coordinates_GFp(group, public,
2593	x, y, NULL((void *)0)) != 1) {
2594	ret = SSH_ERR_LIBCRYPTO_ERROR-22;
2595	goto out;
2596	}
2597	if (BN_num_bits(x) <= BN_num_bits(order) / 2 \|\|
2598	BN_num_bits(y) <= BN_num_bits(order) / 2)
2599	goto out;
2600
2601	/* nQ == infinity (n == order of subgroup) */
2602	if ((nq = EC_POINT_new(group)) == NULL((void *)0)) {
2603	ret = SSH_ERR_ALLOC_FAIL-2;
2604	goto out;
2605	}
2606	if (EC_POINT_mul(group, nq, NULL((void )0), public, order, NULL((void )0)) != 1) {
2607	ret = SSH_ERR_LIBCRYPTO_ERROR-22;
2608	goto out;
2609	}
2610	if (EC_POINT_is_at_infinity(group, nq) != 1)
2611	goto out;
2612
2613	/* x < order - 1, y < order - 1 */
2614	if (!BN_sub(tmp, order, BN_value_one())) {
2615	ret = SSH_ERR_LIBCRYPTO_ERROR-22;
2616	goto out;
2617	}
2618	if (BN_cmp(x, tmp) >= 0 \|\| BN_cmp(y, tmp) >= 0)
2619	goto out;
2620	ret = 0;
2621	out:
2622	BN_clear_free(x);
2623	BN_clear_free(y);
2624	BN_clear_free(order);
2625	BN_clear_free(tmp);
2626	EC_POINT_free(nq);
2627	return ret;
2628	}
2629
2630	int
2631	sshkey_ec_validate_private(const EC_KEY *key)
2632	{
2633	BIGNUM order = NULL((void )0), tmp = NULL((void )0);
2634	int ret = SSH_ERR_KEY_INVALID_EC_VALUE-20;
2635
2636	if ((order = BN_new()) == NULL((void )0) \|\| (tmp = BN_new()) == NULL((void )0)) {
2637	ret = SSH_ERR_ALLOC_FAIL-2;
2638	goto out;
2639	}
2640
2641	/* log2(private) > log2(order)/2 */
2642	if (EC_GROUP_get_order(EC_KEY_get0_group(key), order, NULL((void *)0)) != 1) {
2643	ret = SSH_ERR_LIBCRYPTO_ERROR-22;
2644	goto out;
2645	}
2646	if (BN_num_bits(EC_KEY_get0_private_key(key)) <=
2647	BN_num_bits(order) / 2)
2648	goto out;
2649
2650	/* private < order - 1 */
2651	if (!BN_sub(tmp, order, BN_value_one())) {
2652	ret = SSH_ERR_LIBCRYPTO_ERROR-22;
2653	goto out;
2654	}
2655	if (BN_cmp(EC_KEY_get0_private_key(key), tmp) >= 0)
2656	goto out;
2657	ret = 0;
2658	out:
2659	BN_clear_free(order);
2660	BN_clear_free(tmp);
2661	return ret;
2662	}
2663
2664	void
2665	sshkey_dump_ec_point(const EC_GROUP group, const EC_POINT point)
2666	{
2667	BIGNUM x = NULL((void )0), y = NULL((void )0);
2668
2669	if (point == NULL((void *)0)) {
2670	fputs("point=(NULL)\n", stderr(&__sF[2]));
2671	return;
2672	}
2673	if ((x = BN_new()) == NULL((void )0) \|\| (y = BN_new()) == NULL((void )0)) {
2674	fprintf(stderr(&__sF[2]), "%s: BN_new failed\n", __func__);
2675	goto out;
2676	}
2677	if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
2678	NID_X9_62_prime_field406) {
2679	fprintf(stderr(&__sF[2]), "%s: group is not a prime field\n", __func__);
2680	goto out;
2681	}
2682	if (EC_POINT_get_affine_coordinates_GFp(group, point,
2683	x, y, NULL((void *)0)) != 1) {
2684	fprintf(stderr(&__sF[2]), "%s: EC_POINT_get_affine_coordinates_GFp\n",
2685	__func__);
2686	goto out;
2687	}
2688	fputs("x=", stderr(&__sF[2]));
2689	BN_print_fp(stderr(&__sF[2]), x);
2690	fputs("\ny=", stderr(&__sF[2]));
2691	BN_print_fp(stderr(&__sF[2]), y);
2692	fputs("\n", stderr(&__sF[2]));
2693	out:
2694	BN_clear_free(x);
2695	BN_clear_free(y);
2696	}
2697
2698	void
2699	sshkey_dump_ec_key(const EC_KEY *key)
2700	{
2701	const BIGNUM *exponent;
2702
2703	sshkey_dump_ec_point(EC_KEY_get0_group(key),
2704	EC_KEY_get0_public_key(key));
2705	fputs("exponent=", stderr(&__sF[2]));
2706	if ((exponent = EC_KEY_get0_private_key(key)) == NULL((void *)0))
2707	fputs("(NULL)", stderr(&__sF[2]));
2708	else
2709	BN_print_fp(stderr(&__sF[2]), EC_KEY_get0_private_key(key));
2710	fputs("\n", stderr(&__sF[2]));
2711	}
2712	#endif /* WITH_OPENSSL */
2713
2714	static int
2715	sshkey_private_to_blob2(struct sshkey prv, struct sshbuf blob,
2716	const char passphrase, const char comment, const char *ciphername,
2717	int rounds)
2718	{
2719	u_char cp, key = NULL((void )0), pubkeyblob = NULL((void *)0);
2720	u_char salt[SALT_LEN16];
2721	size_t i, pubkeylen, keylen, ivlen, blocksize, authlen;
2722	u_int check;
2723	int r = SSH_ERR_INTERNAL_ERROR-1;
2724	struct sshcipher_ctx ciphercontext = NULL((void )0);
2725	const struct sshcipher *cipher;
2726	const char *kdfname = KDFNAME"bcrypt";
2727	struct sshbuf encoded = NULL((void )0), encrypted = NULL((void )0), kdf = NULL((void )0);
2728
2729	if (rounds <= 0)
2730	rounds = DEFAULT_ROUNDS24;
2731	if (passphrase == NULL((void *)0) \|\| !strlen(passphrase)) {
2732	ciphername = "none";
2733	kdfname = "none";
2734	} else if (ciphername == NULL((void *)0))
2735	ciphername = DEFAULT_CIPHERNAME"aes256-ctr";
2736	if ((cipher = cipher_by_name(ciphername)) == NULL((void *)0)) {
2737	r = SSH_ERR_INVALID_ARGUMENT-10;
2738	goto out;
2739	}
2740
2741	if ((kdf = sshbuf_new()) == NULL((void *)0) \|\|
2742	(encoded = sshbuf_new()) == NULL((void *)0) \|\|
2743	(encrypted = sshbuf_new()) == NULL((void *)0)) {
2744	r = SSH_ERR_ALLOC_FAIL-2;
2745	goto out;
2746	}
2747	blocksize = cipher_blocksize(cipher);
2748	keylen = cipher_keylen(cipher);
2749	ivlen = cipher_ivlen(cipher);
2750	authlen = cipher_authlen(cipher);
2751	if ((key = calloc(1, keylen + ivlen)) == NULL((void *)0)) {
2752	r = SSH_ERR_ALLOC_FAIL-2;
2753	goto out;
2754	}
2755	if (strcmp(kdfname, "bcrypt") == 0) {
2756	arc4random_buf(salt, SALT_LEN16);
2757	if (bcrypt_pbkdf(passphrase, strlen(passphrase),
2758	salt, SALT_LEN16, key, keylen + ivlen, rounds) < 0) {
2759	r = SSH_ERR_INVALID_ARGUMENT-10;
2760	goto out;
2761	}
2762	if ((r = sshbuf_put_string(kdf, salt, SALT_LEN16)) != 0 \|\|
2763	(r = sshbuf_put_u32(kdf, rounds)) != 0)
2764	goto out;
2765	} else if (strcmp(kdfname, "none") != 0) {
2766	/* Unsupported KDF type */
2767	r = SSH_ERR_KEY_UNKNOWN_CIPHER-42;
2768	goto out;
2769	}
2770	if ((r = cipher_init(&ciphercontext, cipher, key, keylen,
2771	key + keylen, ivlen, 1)) != 0)
2772	goto out;
2773
2774	if ((r = sshbuf_put(encoded, AUTH_MAGIC"openssh-key-v1", sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 \|\|
2775	(r = sshbuf_put_cstring(encoded, ciphername)) != 0 \|\|
2776	(r = sshbuf_put_cstring(encoded, kdfname)) != 0 \|\|
2777	(r = sshbuf_put_stringb(encoded, kdf)) != 0 \|\|
2778	(r = sshbuf_put_u32(encoded, 1)) != 0 \|\| /* number of keys */
2779	(r = sshkey_to_blob(prv, &pubkeyblob, &pubkeylen)) != 0 \|\|
2780	(r = sshbuf_put_string(encoded, pubkeyblob, pubkeylen)) != 0)
2781	goto out;
2782
2783	/* set up the buffer that will be encrypted */
2784
2785	/* Random check bytes */
2786	check = arc4random();
2787	if ((r = sshbuf_put_u32(encrypted, check)) != 0 \|\|
2788	(r = sshbuf_put_u32(encrypted, check)) != 0)
2789	goto out;
2790
2791	/* append private key and comment*/
2792	if ((r = sshkey_private_serialize_opt(prv, encrypted,
2793	SSHKEY_SERIALIZE_FULL)) != 0 \|\|
2794	(r = sshbuf_put_cstring(encrypted, comment)) != 0)
2795	goto out;
2796
2797	/* padding */
2798	i = 0;
2799	while (sshbuf_len(encrypted) % blocksize) {
2800	if ((r = sshbuf_put_u8(encrypted, ++i & 0xff)) != 0)
2801	goto out;
2802	}
2803
2804	/* length in destination buffer */
2805	if ((r = sshbuf_put_u32(encoded, sshbuf_len(encrypted))) != 0)
2806	goto out;
2807
2808	/* encrypt */
2809	if ((r = sshbuf_reserve(encoded,
2810	sshbuf_len(encrypted) + authlen, &cp)) != 0)
2811	goto out;
2812	if ((r = cipher_crypt(ciphercontext, 0, cp,
2813	sshbuf_ptr(encrypted), sshbuf_len(encrypted), 0, authlen)) != 0)
2814	goto out;
2815
2816	sshbuf_reset(blob);
2817
2818	/* assemble uuencoded key */
2819	if ((r = sshbuf_put(blob, MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n", MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1))) != 0 \|\|
2820	(r = sshbuf_dtob64(encoded, blob, 1)) != 0 \|\|
2821	(r = sshbuf_put(blob, MARK_END"-----END OPENSSH PRIVATE KEY-----\n", MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1))) != 0)
2822	goto out;
2823
2824	/* success */
2825	r = 0;
2826
2827	out:
2828	sshbuf_free(kdf);
2829	sshbuf_free(encoded);
2830	sshbuf_free(encrypted);
2831	cipher_free(ciphercontext);
2832	explicit_bzero(salt, sizeof(salt));
2833	if (key != NULL((void *)0))
2834	freezero(key, keylen + ivlen);
2835	if (pubkeyblob != NULL((void *)0))
2836	freezero(pubkeyblob, pubkeylen);
2837	return r;
2838	}
2839
2840	static int
2841	private2_uudecode(struct sshbuf blob, struct sshbuf *decodedp)
2842	{
2843	const u_char *cp;
2844	size_t encoded_len;
2845	int r;
2846	u_char last;
2847	struct sshbuf encoded = NULL((void )0), decoded = NULL((void )0);
2848
2849	if (blob == NULL((void )0) \|\| decodedp == NULL((void )0))
2850	return SSH_ERR_INVALID_ARGUMENT-10;
2851
2852	decodedp = NULL((void )0);
2853
2854	if ((encoded = sshbuf_new()) == NULL((void *)0) \|\|
2855	(decoded = sshbuf_new()) == NULL((void *)0)) {
2856	r = SSH_ERR_ALLOC_FAIL-2;
2857	goto out;
2858	}
2859
2860	/* check preamble */
2861	cp = sshbuf_ptr(blob);
2862	encoded_len = sshbuf_len(blob);
2863	if (encoded_len < (MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1) + MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1)) \|\|
2864	memcmp(cp, MARK_BEGIN"-----BEGIN OPENSSH PRIVATE KEY-----\n", MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1)) != 0) {
2865	r = SSH_ERR_INVALID_FORMAT-4;
2866	goto out;
2867	}
2868	cp += MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1);
2869	encoded_len -= MARK_BEGIN_LEN(sizeof("-----BEGIN OPENSSH PRIVATE KEY-----\n") - 1);
2870
2871	/* Look for end marker, removing whitespace as we go */
2872	while (encoded_len > 0) {
2873	if (cp != '\n' && cp != '\r') {
2874	if ((r = sshbuf_put_u8(encoded, *cp)) != 0)
2875	goto out;
2876	}
2877	last = *cp;
2878	encoded_len--;
2879	cp++;
2880	if (last == '\n') {
2881	if (encoded_len >= MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1) &&
2882	memcmp(cp, MARK_END"-----END OPENSSH PRIVATE KEY-----\n", MARK_END_LEN(sizeof("-----END OPENSSH PRIVATE KEY-----\n") - 1)) == 0) {
2883	/* \0 terminate */
2884	if ((r = sshbuf_put_u8(encoded, 0)) != 0)
2885	goto out;
2886	break;
2887	}
2888	}
2889	}
2890	if (encoded_len == 0) {
2891	r = SSH_ERR_INVALID_FORMAT-4;
2892	goto out;
2893	}
2894
2895	/* decode base64 */
2896	if ((r = sshbuf_b64tod(decoded, (char *)sshbuf_ptr(encoded))) != 0)
2897	goto out;
2898
2899	/* check magic */
2900	if (sshbuf_len(decoded) < sizeof(AUTH_MAGIC"openssh-key-v1") \|\|
2901	memcmp(sshbuf_ptr(decoded), AUTH_MAGIC"openssh-key-v1", sizeof(AUTH_MAGIC"openssh-key-v1"))) {
2902	r = SSH_ERR_INVALID_FORMAT-4;
2903	goto out;
2904	}
2905	/* success */
2906	*decodedp = decoded;
2907	decoded = NULL((void *)0);
2908	r = 0;
2909	out:
2910	sshbuf_free(encoded);
2911	sshbuf_free(decoded);
2912	return r;
2913	}
2914
2915	static int
2916	private2_decrypt(struct sshbuf decoded, const char passphrase,
2917	struct sshbuf decryptedp, struct sshkey pubkeyp)
2918	{
2919	char ciphername = NULL((void )0), kdfname = NULL((void )0);
2920	const struct sshcipher cipher = NULL((void )0);
2921	int r = SSH_ERR_INTERNAL_ERROR-1;
2922	size_t keylen = 0, ivlen = 0, authlen = 0, slen = 0;
2923	struct sshbuf kdf = NULL((void )0), decrypted = NULL((void )0);
2924	struct sshcipher_ctx ciphercontext = NULL((void )0);
2925	struct sshkey pubkey = NULL((void )0);
2926	u_char key = NULL((void )0), salt = NULL((void )0), *dp;
2927	u_int blocksize, rounds, nkeys, encrypted_len, check1, check2;
2928
2929	if (decoded == NULL((void )0) \|\| decryptedp == NULL((void )0) \|\| pubkeyp == NULL((void *)0))
2930	return SSH_ERR_INVALID_ARGUMENT-10;
2931
2932	decryptedp = NULL((void )0);
2933	pubkeyp = NULL((void )0);
2934
2935	if ((decrypted = sshbuf_new()) == NULL((void *)0)) {
2936	r = SSH_ERR_ALLOC_FAIL-2;
2937	goto out;
2938	}
2939
2940	/* parse public portion of key */
2941	if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 \|\|
2942	(r = sshbuf_get_cstring(decoded, &ciphername, NULL((void *)0))) != 0 \|\|
2943	(r = sshbuf_get_cstring(decoded, &kdfname, NULL((void *)0))) != 0 \|\|
2944	(r = sshbuf_froms(decoded, &kdf)) != 0 \|\|
2945	(r = sshbuf_get_u32(decoded, &nkeys)) != 0)
2946	goto out;
2947
2948	if (nkeys != 1) {
2949	/* XXX only one key supported at present */
2950	r = SSH_ERR_INVALID_FORMAT-4;
2951	goto out;
2952	}
2953
2954	if ((r = sshkey_froms(decoded, &pubkey)) != 0 \|\|
2955	(r = sshbuf_get_u32(decoded, &encrypted_len)) != 0)
2956	goto out;
2957
2958	if ((cipher = cipher_by_name(ciphername)) == NULL((void *)0)) {
2959	r = SSH_ERR_KEY_UNKNOWN_CIPHER-42;
2960	goto out;
2961	}
2962	if (strcmp(kdfname, "none") != 0 && strcmp(kdfname, "bcrypt") != 0) {
2963	r = SSH_ERR_KEY_UNKNOWN_CIPHER-42;
2964	goto out;
2965	}
2966	if (strcmp(kdfname, "none") == 0 && strcmp(ciphername, "none") != 0) {
2967	r = SSH_ERR_INVALID_FORMAT-4;
2968	goto out;
2969	}
2970	if ((passphrase == NULL((void *)0) \|\| strlen(passphrase) == 0) &&
2971	strcmp(kdfname, "none") != 0) {
2972	/* passphrase required */
2973	r = SSH_ERR_KEY_WRONG_PASSPHRASE-43;
2974	goto out;
2975	}
2976
2977	/* check size of encrypted key blob */
2978	blocksize = cipher_blocksize(cipher);
2979	if (encrypted_len < blocksize \|\| (encrypted_len % blocksize) != 0) {
2980	r = SSH_ERR_INVALID_FORMAT-4;
2981	goto out;
2982	}
2983
2984	/* setup key */
2985	keylen = cipher_keylen(cipher);
2986	ivlen = cipher_ivlen(cipher);
2987	authlen = cipher_authlen(cipher);
2988	if ((key = calloc(1, keylen + ivlen)) == NULL((void *)0)) {
2989	r = SSH_ERR_ALLOC_FAIL-2;
2990	goto out;
2991	}
2992	if (strcmp(kdfname, "bcrypt") == 0) {
2993	if ((r = sshbuf_get_string(kdf, &salt, &slen)) != 0 \|\|
2994	(r = sshbuf_get_u32(kdf, &rounds)) != 0)
2995	goto out;
2996	if (bcrypt_pbkdf(passphrase, strlen(passphrase), salt, slen,
2997	key, keylen + ivlen, rounds) < 0) {
2998	r = SSH_ERR_INVALID_FORMAT-4;
2999	goto out;
3000	}
3001	}
3002
3003	/* check that an appropriate amount of auth data is present */
3004	if (sshbuf_len(decoded) < authlen \|\|
3005	sshbuf_len(decoded) - authlen < encrypted_len) {
3006	r = SSH_ERR_INVALID_FORMAT-4;
3007	goto out;
3008	}
3009
3010	/* decrypt private portion of key */
3011	if ((r = sshbuf_reserve(decrypted, encrypted_len, &dp)) != 0 \|\|
3012	(r = cipher_init(&ciphercontext, cipher, key, keylen,
3013	key + keylen, ivlen, 0)) != 0)
3014	goto out;
3015	if ((r = cipher_crypt(ciphercontext, 0, dp, sshbuf_ptr(decoded),
3016	encrypted_len, 0, authlen)) != 0) {
3017	/* an integrity error here indicates an incorrect passphrase */
3018	if (r == SSH_ERR_MAC_INVALID-30)
3019	r = SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3020	goto out;
3021	}
3022	if ((r = sshbuf_consume(decoded, encrypted_len + authlen)) != 0)
3023	goto out;
3024	/* there should be no trailing data */
3025	if (sshbuf_len(decoded) != 0) {
3026	r = SSH_ERR_INVALID_FORMAT-4;
3027	goto out;
3028	}
3029
3030	/* check check bytes */
3031	if ((r = sshbuf_get_u32(decrypted, &check1)) != 0 \|\|
3032	(r = sshbuf_get_u32(decrypted, &check2)) != 0)
3033	goto out;
3034	if (check1 != check2) {
3035	r = SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3036	goto out;
3037	}
3038	/* success */
3039	*decryptedp = decrypted;
3040	decrypted = NULL((void *)0);
3041	*pubkeyp = pubkey;
3042	pubkey = NULL((void *)0);
3043	r = 0;
3044	out:
3045	cipher_free(ciphercontext);
3046	free(ciphername);
3047	free(kdfname);
3048	sshkey_free(pubkey);
3049	if (salt != NULL((void *)0)) {
3050	explicit_bzero(salt, slen);
3051	free(salt);
3052	}
3053	if (key != NULL((void *)0)) {
3054	explicit_bzero(key, keylen + ivlen);
3055	free(key);
3056	}
3057	sshbuf_free(kdf);
3058	sshbuf_free(decrypted);
3059	return r;
3060	}
3061
3062	static int
3063	sshkey_parse_private2(struct sshbuf blob, int type, const char passphrase,
3064	struct sshkey keyp, char commentp)
3065	{
3066	char comment = NULL((void )0);
3067	int r = SSH_ERR_INTERNAL_ERROR-1;
3068	struct sshbuf decoded = NULL((void )0), decrypted = NULL((void )0);
3069	struct sshkey k = NULL((void )0), pubkey = NULL((void )0);
3070
3071	if (keyp != NULL((void *)0))
3072	keyp = NULL((void )0);
3073	if (commentp != NULL((void *)0))
3074	commentp = NULL((void )0);
3075
3076	/* Undo base64 encoding and decrypt the private section */
3077	if ((r = private2_uudecode(blob, &decoded)) != 0 \|\|
3078	(r = private2_decrypt(decoded, passphrase,
3079	&decrypted, &pubkey)) != 0)
3080	goto out;
3081
3082	if (type != KEY_UNSPEC &&
3083	sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3084	r = SSH_ERR_KEY_TYPE_MISMATCH-13;
3085	goto out;
3086	}
3087
3088	/* Load the private key and comment */
3089	if ((r = sshkey_private_deserialize(decrypted, &k)) != 0 \|\|
3090	(r = sshbuf_get_cstring(decrypted, &comment, NULL((void *)0))) != 0)
3091	goto out;
3092
3093	/* Check deterministic padding after private section */
3094	if ((r = private2_check_padding(decrypted)) != 0)
3095	goto out;
3096
3097	/* Check that the public key in the envelope matches the private key */
3098	if (!sshkey_equal(pubkey, k)) {
3099	r = SSH_ERR_INVALID_FORMAT-4;
3100	goto out;
3101	}
3102
3103	/* success */
3104	r = 0;
3105	if (keyp != NULL((void *)0)) {
3106	*keyp = k;
3107	k = NULL((void *)0);
3108	}
3109	if (commentp != NULL((void *)0)) {
3110	*commentp = comment;
3111	comment = NULL((void *)0);
3112	}
3113	out:
3114	free(comment);
3115	sshbuf_free(decoded);
3116	sshbuf_free(decrypted);
3117	sshkey_free(k);
3118	sshkey_free(pubkey);
3119	return r;
3120	}
3121
3122	static int
3123	sshkey_parse_private2_pubkey(struct sshbuf *blob, int type,
3124	struct sshkey **keyp)
3125	{
3126	int r = SSH_ERR_INTERNAL_ERROR-1;
3127	struct sshbuf decoded = NULL((void )0);
3128	struct sshkey pubkey = NULL((void )0);
3129	u_int nkeys = 0;
3130
3131	if (keyp != NULL((void *)0))
3132	keyp = NULL((void )0);
3133
3134	if ((r = private2_uudecode(blob, &decoded)) != 0)
3135	goto out;
3136	/* parse public key from unencrypted envelope */
3137	if ((r = sshbuf_consume(decoded, sizeof(AUTH_MAGIC"openssh-key-v1"))) != 0 \|\|
3138	(r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void )0), ((void )0))) != 0 \|\| /* cipher */
3139	(r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void )0), ((void )0))) != 0 \|\| /* KDF alg */
3140	(r = sshbuf_skip_string(decoded)sshbuf_get_string_direct(decoded, ((void )0), ((void )0))) != 0 \|\| /* KDF hint */
3141	(r = sshbuf_get_u32(decoded, &nkeys)) != 0)
3142	goto out;
3143
3144	if (nkeys != 1) {
3145	/* XXX only one key supported at present */
3146	r = SSH_ERR_INVALID_FORMAT-4;
3147	goto out;
3148	}
3149
3150	/* Parse the public key */
3151	if ((r = sshkey_froms(decoded, &pubkey)) != 0)
3152	goto out;
3153
3154	if (type != KEY_UNSPEC &&
3155	sshkey_type_plain(type) != sshkey_type_plain(pubkey->type)) {
3156	r = SSH_ERR_KEY_TYPE_MISMATCH-13;
3157	goto out;
3158	}
3159
3160	/* success */
3161	r = 0;
3162	if (keyp != NULL((void *)0)) {
3163	*keyp = pubkey;
3164	pubkey = NULL((void *)0);
3165	}
3166	out:
3167	sshbuf_free(decoded);
3168	sshkey_free(pubkey);
3169	return r;
3170	}
3171
3172	#ifdef WITH_OPENSSL1
3173	/* convert SSH v2 key to PEM or PKCS#8 format */
3174	static int
3175	sshkey_private_to_blob_pem_pkcs8(struct sshkey key, struct sshbuf buf,
3176	int format, const char _passphrase, const char comment)
3177	{
3178	int was_shielded = sshkey_is_shielded(key);
3179	int success, r;
3180	int blen, len = strlen(_passphrase);
3181	u_char passphrase = (len > 0) ? (u_char )_passphrase : NULL((void *)0);
3182	const EVP_CIPHER cipher = (len > 0) ? EVP_aes_128_cbc() : NULL((void )0);
3183	char *bptr;
3184	BIO bio = NULL((void )0);
3185	struct sshbuf *blob;
3186	EVP_PKEY pkey = NULL((void )0);
3187
3188	if (len > 0 && len <= 4)
3189	return SSH_ERR_PASSPHRASE_TOO_SHORT-40;
3190	if ((blob = sshbuf_new()) == NULL((void *)0))
3191	return SSH_ERR_ALLOC_FAIL-2;
3192	if ((bio = BIO_new(BIO_s_mem())) == NULL((void *)0)) {
3193	r = SSH_ERR_ALLOC_FAIL-2;
3194	goto out;
3195	}
3196	if (format == SSHKEY_PRIVATE_PKCS8 && (pkey = EVP_PKEY_new()) == NULL((void *)0)) {
3197	r = SSH_ERR_ALLOC_FAIL-2;
3198	goto out;
3199	}
3200	if ((r = sshkey_unshield_private(key)) != 0)
3201	goto out;
3202
3203	switch (key->type) {
3204	#ifdef WITH_DSA1
3205	case KEY_DSA:
3206	if (format == SSHKEY_PRIVATE_PEM) {
3207	success = PEM_write_bio_DSAPrivateKey(bio, key->dsa,
3208	cipher, passphrase, len, NULL((void )0), NULL((void )0));
3209	} else {
3210	success = EVP_PKEY_set1_DSA(pkey, key->dsa);
3211	}
3212	break;
3213	#endif
3214	case KEY_ECDSA:
3215	if (format == SSHKEY_PRIVATE_PEM) {
3216	success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa,
3217	cipher, passphrase, len, NULL((void )0), NULL((void )0));
3218	} else {
3219	success = EVP_PKEY_set1_EC_KEY(pkey, key->ecdsa);
3220	}
3221	break;
3222	case KEY_RSA:
3223	if (format == SSHKEY_PRIVATE_PEM) {
3224	success = PEM_write_bio_RSAPrivateKey(bio, key->rsa,
3225	cipher, passphrase, len, NULL((void )0), NULL((void )0));
3226	} else {
3227	success = EVP_PKEY_set1_RSA(pkey, key->rsa);
3228	}
3229	break;
3230	default:
3231	success = 0;
3232	break;
3233	}
3234	if (success == 0) {
3235	r = SSH_ERR_LIBCRYPTO_ERROR-22;
3236	goto out;
3237	}
3238	if (format == SSHKEY_PRIVATE_PKCS8) {
3239	if ((success = PEM_write_bio_PrivateKey(bio, pkey, cipher,
3240	passphrase, len, NULL((void )0), NULL((void )0))) == 0) {
3241	r = SSH_ERR_LIBCRYPTO_ERROR-22;
3242	goto out;
3243	}
3244	}
3245	if ((blen = BIO_get_mem_data(bio, &bptr)BIO_ctrl(bio,3,0,(char *)&bptr)) <= 0) {
3246	r = SSH_ERR_INTERNAL_ERROR-1;
3247	goto out;
3248	}
3249	if ((r = sshbuf_put(blob, bptr, blen)) != 0)
3250	goto out;
3251	r = 0;
3252	out:
3253	if (was_shielded)
3254	r = sshkey_shield_private(key);
3255	if (r == 0)
3256	r = sshbuf_putb(buf, blob);
3257
3258	EVP_PKEY_free(pkey);
3259	sshbuf_free(blob);
3260	BIO_free(bio);
3261	return r;
3262	}
3263	#endif /* WITH_OPENSSL */
3264
3265	/* Serialise "key" to buffer "blob" */
3266	int
3267	sshkey_private_to_fileblob(struct sshkey key, struct sshbuf blob,
3268	const char passphrase, const char comment,
3269	int format, const char *openssh_format_cipher, int openssh_format_rounds)
3270	{
3271	switch (key->type) {
3272	#ifdef WITH_OPENSSL1
3273	case KEY_DSA:
3274	case KEY_ECDSA:
3275	case KEY_RSA:
3276	break; /* see below */
3277	#endif /* WITH_OPENSSL */
3278	case KEY_ED25519:
3279	case KEY_ED25519_SK:
3280	#ifdef WITH_XMSS
3281	case KEY_XMSS:
3282	#endif /* WITH_XMSS */
3283	#ifdef WITH_OPENSSL1
3284	case KEY_ECDSA_SK:
3285	#endif /* WITH_OPENSSL */
3286	return sshkey_private_to_blob2(key, blob, passphrase,
3287	comment, openssh_format_cipher, openssh_format_rounds);
3288	default:
3289	return SSH_ERR_KEY_TYPE_UNKNOWN-14;
3290	}
3291
3292	#ifdef WITH_OPENSSL1
3293	switch (format) {
3294	case SSHKEY_PRIVATE_OPENSSH:
3295	return sshkey_private_to_blob2(key, blob, passphrase,
3296	comment, openssh_format_cipher, openssh_format_rounds);
3297	case SSHKEY_PRIVATE_PEM:
3298	case SSHKEY_PRIVATE_PKCS8:
3299	return sshkey_private_to_blob_pem_pkcs8(key, blob,
3300	format, passphrase, comment);
3301	default:
3302	return SSH_ERR_INVALID_ARGUMENT-10;
3303	}
3304	#endif /* WITH_OPENSSL */
3305	}
3306
3307	#ifdef WITH_OPENSSL1
3308	static int
3309	translate_libcrypto_error(unsigned long pem_err)
3310	{
3311	int pem_reason = ERR_GET_REASON(pem_err)(int)((pem_err)&0xfffL);
3312
3313	switch (ERR_GET_LIB(pem_err)(int)((((unsigned long)pem_err)>>24L)&0xffL)) {
3314	case ERR_LIB_PEM9:
3315	switch (pem_reason) {
3316	case PEM_R_BAD_PASSWORD_READ104:
3317	case PEM_R_PROBLEMS_GETTING_PASSWORD109:
3318	case PEM_R_BAD_DECRYPT101:
3319	return SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3320	default:
3321	return SSH_ERR_INVALID_FORMAT-4;
3322	}
3323	case ERR_LIB_EVP6:
3324	switch (pem_reason) {
3325	case EVP_R_BAD_DECRYPT100:
3326	return SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3327	#ifdef EVP_R_BN_DECODE_ERROR112
3328	case EVP_R_BN_DECODE_ERROR112:
3329	#endif
3330	case EVP_R_DECODE_ERROR114:
3331	#ifdef EVP_R_PRIVATE_KEY_DECODE_ERROR145
3332	case EVP_R_PRIVATE_KEY_DECODE_ERROR145:
3333	#endif
3334	return SSH_ERR_INVALID_FORMAT-4;
3335	default:
3336	return SSH_ERR_LIBCRYPTO_ERROR-22;
3337	}
3338	case ERR_LIB_ASN113:
3339	return SSH_ERR_INVALID_FORMAT-4;
3340	}
3341	return SSH_ERR_LIBCRYPTO_ERROR-22;
3342	}
3343
3344	static void
3345	clear_libcrypto_errors(void)
3346	{
3347	while (ERR_get_error() != 0)
3348	;
3349	}
3350
3351	/*
3352	* Translate OpenSSL error codes to determine whether
3353	* passphrase is required/incorrect.
3354	*/
3355	static int
3356	convert_libcrypto_error(void)
3357	{
3358	/*
3359	* Some password errors are reported at the beginning
3360	* of the error queue.
3361	*/
3362	if (translate_libcrypto_error(ERR_peek_error()) ==
3363	SSH_ERR_KEY_WRONG_PASSPHRASE-43)
3364	return SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3365	return translate_libcrypto_error(ERR_peek_last_error());
3366	}
3367
3368	static int
3369	sshkey_parse_private_pem_fileblob(struct sshbuf *blob, int type,
3370	const char passphrase, struct sshkey *keyp)
3371	{
3372	EVP_PKEY pk = NULL((void )0);
3373	struct sshkey prv = NULL((void )0);
3374	BIO bio = NULL((void )0);
3375	int r;
3376
3377	if (keyp != NULL((void *)0))
3378	keyp = NULL((void )0);
3379
3380	if ((bio = BIO_new(BIO_s_mem())) == NULL((void *)0) \|\| sshbuf_len(blob) > INT_MAX0x7fffffff)
3381	return SSH_ERR_ALLOC_FAIL-2;
3382	if (BIO_write(bio, sshbuf_ptr(blob), sshbuf_len(blob)) !=
3383	(int)sshbuf_len(blob)) {
3384	r = SSH_ERR_ALLOC_FAIL-2;
3385	goto out;
3386	}
3387
3388	clear_libcrypto_errors();
3389	if ((pk = PEM_read_bio_PrivateKey(bio, NULL((void )0), NULL((void )0),
3390	(char )passphrase)) == NULL((void )0)) {
3391	/*
3392	* libcrypto may return various ASN.1 errors when attempting
3393	* to parse a key with an incorrect passphrase.
3394	* Treat all format errors as "incorrect passphrase" if a
3395	* passphrase was supplied.
3396	*/
3397	if (passphrase != NULL((void )0) && passphrase != '\0')
3398	r = SSH_ERR_KEY_WRONG_PASSPHRASE-43;
3399	else
3400	r = convert_libcrypto_error();
3401	goto out;
3402	}
3403	if (EVP_PKEY_base_id(pk) == EVP_PKEY_RSA6 &&
3404	(type == KEY_UNSPEC \|\| type == KEY_RSA)) {
3405	if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void *)0)) {
3406	r = SSH_ERR_ALLOC_FAIL-2;
3407	goto out;
3408	}
3409	prv->rsa = EVP_PKEY_get1_RSA(pk);
3410	prv->type = KEY_RSA;
3411	#ifdef DEBUG_PK
3412	RSA_print_fp(stderr(&__sF[2]), prv->rsa, 8);
3413	#endif
3414	if (RSA_blinding_on(prv->rsa, NULL((void *)0)) != 1) {
3415	r = SSH_ERR_LIBCRYPTO_ERROR-22;
3416	goto out;
3417	}
3418	if ((r = sshkey_check_rsa_length(prv, 0)) != 0)
3419	goto out;
3420	#ifdef WITH_DSA1
3421	} else if (EVP_PKEY_base_id(pk) == EVP_PKEY_DSA116 &&
3422	(type == KEY_UNSPEC \|\| type == KEY_DSA)) {
3423	if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void *)0)) {
3424	r = SSH_ERR_ALLOC_FAIL-2;
3425	goto out;
3426	}
3427	prv->dsa = EVP_PKEY_get1_DSA(pk);
3428	prv->type = KEY_DSA;
3429	#ifdef DEBUG_PK
3430	DSA_print_fp(stderr(&__sF[2]), prv->dsa, 8);
3431	#endif
3432	#endif
3433	} else if (EVP_PKEY_base_id(pk) == EVP_PKEY_EC408 &&
3434	(type == KEY_UNSPEC \|\| type == KEY_ECDSA)) {
3435	if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void *)0)) {
3436	r = SSH_ERR_ALLOC_FAIL-2;
3437	goto out;
3438	}
3439	prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk);
3440	prv->type = KEY_ECDSA;
3441	prv->ecdsa_nid = sshkey_ecdsa_key_to_nid(prv->ecdsa);
3442	if (prv->ecdsa_nid == -1 \|\|
3443	sshkey_curve_nid_to_name(prv->ecdsa_nid) == NULL((void *)0) \|\|
3444	sshkey_ec_validate_public(EC_KEY_get0_group(prv->ecdsa),
3445	EC_KEY_get0_public_key(prv->ecdsa)) != 0 \|\|
3446	sshkey_ec_validate_private(prv->ecdsa) != 0) {
3447	r = SSH_ERR_INVALID_FORMAT-4;
3448	goto out;
3449	}
3450	#ifdef DEBUG_PK
3451	if (prv != NULL((void )0) && prv->ecdsa != NULL((void )0))
3452	sshkey_dump_ec_key(prv->ecdsa);
3453	#endif
3454	} else if (EVP_PKEY_base_id(pk) == EVP_PKEY_ED25519952 &&
3455	(type == KEY_UNSPEC \|\| type == KEY_ED25519)) {
3456	size_t len;
3457
3458	if ((prv = sshkey_new(KEY_UNSPEC)) == NULL((void *)0) \|\|
3459	(prv->ed25519_sk = calloc(1, ED25519_SK_SZ64U)) == NULL((void *)0) \|\|
3460	(prv->ed25519_pk = calloc(1, ED25519_PK_SZ32U)) == NULL((void *)0)) {
3461	r = SSH_ERR_ALLOC_FAIL-2;
3462	goto out;
3463	}
3464	prv->type = KEY_ED25519;
3465	len = ED25519_PK_SZ32U;
3466	if (!EVP_PKEY_get_raw_public_key(pk, prv->ed25519_pk, &len)) {
3467	r = SSH_ERR_LIBCRYPTO_ERROR-22;
3468	goto out;
3469	}
3470	if (len != ED25519_PK_SZ32U) {
3471	r = SSH_ERR_INVALID_FORMAT-4;
3472	goto out;
3473	}
3474	len = ED25519_SK_SZ64U - ED25519_PK_SZ32U;
3475	if (!EVP_PKEY_get_raw_private_key(pk, prv->ed25519_sk, &len)) {
3476	r = SSH_ERR_LIBCRYPTO_ERROR-22;
3477	goto out;
3478	}
3479	if (len != ED25519_SK_SZ64U - ED25519_PK_SZ32U) {
3480	r = SSH_ERR_INVALID_FORMAT-4;
3481	goto out;
3482	}
3483	/* Append the public key to our private key */
3484	memcpy(prv->ed25519_sk + (ED25519_SK_SZ64U - ED25519_PK_SZ32U),
3485	prv->ed25519_pk, ED25519_PK_SZ32U);
3486	#ifdef DEBUG_PK
3487	sshbuf_dump_data(prv->ed25519_sk, ED25519_SK_SZ64U, stderr(&__sF[2]));
3488	#endif
3489	} else {
3490	r = SSH_ERR_INVALID_FORMAT-4;
3491	goto out;
3492	}
3493	r = 0;
3494	if (keyp != NULL((void *)0)) {
3495	*keyp = prv;
3496	prv = NULL((void *)0);
3497	}
3498	out:
3499	BIO_free(bio);
3500	EVP_PKEY_free(pk);
3501	sshkey_free(prv);
3502	return r;
3503	}
3504	#endif /* WITH_OPENSSL */
3505
3506	int
3507	sshkey_parse_private_fileblob_type(struct sshbuf *blob, int type,
3508	const char passphrase, struct sshkey keyp, char *commentp)
3509	{
3510	int r = SSH_ERR_INTERNAL_ERROR-1;
3511
3512	if (keyp != NULL((void *)0))
3513	keyp = NULL((void )0);
3514	if (commentp != NULL((void *)0))
3515	commentp = NULL((void )0);
3516
3517	switch (type) {
3518	case KEY_XMSS:
3519	/* No fallback for new-format-only keys */
3520	return sshkey_parse_private2(blob, type, passphrase,
3521	keyp, commentp);
3522	default:
3523	r = sshkey_parse_private2(blob, type, passphrase, keyp,
3524	commentp);
3525	/* Only fallback to PEM parser if a format error occurred. */
3526	if (r != SSH_ERR_INVALID_FORMAT-4)
3527	return r;
3528	#ifdef WITH_OPENSSL1
3529	return sshkey_parse_private_pem_fileblob(blob, type,
3530	passphrase, keyp);
3531	#else
3532	return SSH_ERR_INVALID_FORMAT-4;
3533	#endif /* WITH_OPENSSL */
3534	}
3535	}
3536
3537	int
3538	sshkey_parse_private_fileblob(struct sshbuf buffer, const char passphrase,
3539	struct sshkey keyp, char commentp)
3540	{
3541	if (keyp != NULL((void *)0))
3542	keyp = NULL((void )0);
3543	if (commentp != NULL((void *)0))
3544	commentp = NULL((void )0);
3545
3546	return sshkey_parse_private_fileblob_type(buffer, KEY_UNSPEC,
3547	passphrase, keyp, commentp);
3548	}
3549
3550	void
3551	sshkey_sig_details_free(struct sshkey_sig_details *details)
3552	{
3553	freezero(details, sizeof(*details));
3554	}
3555
3556	int
3557	sshkey_parse_pubkey_from_private_fileblob_type(struct sshbuf *blob, int type,
3558	struct sshkey **pubkeyp)
3559	{
3560	int r = SSH_ERR_INTERNAL_ERROR-1;
3561
3562	if (pubkeyp != NULL((void *)0))
3563	pubkeyp = NULL((void )0);
3564	/* only new-format private keys bundle a public key inside */
3565	if ((r = sshkey_parse_private2_pubkey(blob, type, pubkeyp)) != 0)
3566	return r;
3567	return 0;
3568	}
3569
3570	#ifdef WITH_XMSS
3571	/*
3572	* serialize the key with the current state and forward the state
3573	* maxsign times.
3574	*/
3575	int
3576	sshkey_private_serialize_maxsign(struct sshkey k, struct sshbuf b,
3577	u_int32_t maxsign, int printerror)
3578	{
3579	int r, rupdate;
3580
3581	if (maxsign == 0 \|\|
3582	sshkey_type_plain(k->type) != KEY_XMSS)
3583	return sshkey_private_serialize_opt(k, b,
3584	SSHKEY_SERIALIZE_DEFAULT);
3585	if ((r = sshkey_xmss_get_state(k, printerror)) != 0 \|\|
3586	(r = sshkey_private_serialize_opt(k, b,
3587	SSHKEY_SERIALIZE_STATE)) != 0 \|\|
3588	(r = sshkey_xmss_forward_state(k, maxsign)) != 0)
3589	goto out;
3590	r = 0;
3591	out:
3592	if ((rupdate = sshkey_xmss_update_state(k, printerror)) != 0) {
3593	if (r == 0)
3594	r = rupdate;
3595	}
3596	return r;
3597	}
3598
3599	u_int32_t
3600	sshkey_signatures_left(const struct sshkey *k)
3601	{
3602	if (sshkey_type_plain(k->type) == KEY_XMSS)
3603	return sshkey_xmss_signatures_left(k);
3604	return 0;
3605	}
3606
3607	int
3608	sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3609	{
3610	if (sshkey_type_plain(k->type) != KEY_XMSS)
3611	return SSH_ERR_INVALID_ARGUMENT-10;
3612	return sshkey_xmss_enable_maxsign(k, maxsign);
3613	}
3614
3615	int
3616	sshkey_set_filename(struct sshkey k, const char filename)
3617	{
3618	if (k == NULL((void *)0))
3619	return SSH_ERR_INVALID_ARGUMENT-10;
3620	if (sshkey_type_plain(k->type) != KEY_XMSS)
3621	return 0;
3622	if (filename == NULL((void *)0))
3623	return SSH_ERR_INVALID_ARGUMENT-10;
3624	if ((k->xmss_filename = strdup(filename)) == NULL((void *)0))
3625	return SSH_ERR_ALLOC_FAIL-2;
3626	return 0;
3627	}
3628	#else
3629	int
3630	sshkey_private_serialize_maxsign(struct sshkey k, struct sshbuf b,
3631	u_int32_t maxsign, int printerror)
3632	{
3633	return sshkey_private_serialize_opt(k, b, SSHKEY_SERIALIZE_DEFAULT);
3634	}
3635
3636	u_int32_t
3637	sshkey_signatures_left(const struct sshkey *k)
3638	{
3639	return 0;
3640	}
3641
3642	int
3643	sshkey_enable_maxsign(struct sshkey *k, u_int32_t maxsign)
3644	{
3645	return SSH_ERR_INVALID_ARGUMENT-10;
3646	}
3647
3648	int
3649	sshkey_set_filename(struct sshkey k, const char filename)
3650	{
3651	if (k == NULL((void *)0))
3652	return SSH_ERR_INVALID_ARGUMENT-10;
3653	return 0;
3654	}
3655	#endif /* WITH_XMSS */